which at Barbadoes forced its way into every part of the Government-house, and tore off most of the roof, though the walls were three feet thick, and the doors and windows had been well barricaded. Obliged to retreat from thence, the Governor and his family fled to the ruins of the foundation of the flag-staff, and, compelled to relinquish that station, they with difficulty reached the cannon of the fortifications, under the carriages of which they took shelter. But here they were not secure, for the cannons were moved by the fury of the wind, and they dreaded every moment that the guns would be dismounted, and crush them by their fall. From the preceding accounts it appears, that the agency of electricity is frequently extensively developed in hurricanes; that they have a progressive motion; that calms of short duration occur during their continuance; after which the wind bursts forth from a quarter different to that from which it has been blowing; peculiarities which have led to a theory respecting storms which may be considered as established in its leading principles. Down to the present century, a hurricane was generally deemed to be simply a gale of wind pursuing with immense velocity a rectilinear direction. Colonel Capper departed from this idea after investigating the storms of the Indian Ocean, and published the conclusion in the year 1801, that the hurricanes he had examined in that region were real whirlwinds of varying diameter, having a progressive as well as a rotatory motion. The evidence collected from the records of an immense number of storms in the Atlantic by Mr Redfield of New York, and in the Indian Ocean by Colonel Reid, has established beyond all dispute the fact, that they are eddies in the atmosphere, having an outer circle, where the air revolves with intense velocity, and an interior space, the diameter of which is sometimes equal to several hundred miles, the vortex of the whirlwind, which is the scene of gusts and lulls, a comparatively slow progressive motion on the surface of land and sea distinguishing the whole. A hurricane, which occurred at New Brunswick in the year 1835, strikingly exhibited the character of a revolving storm; for, while about the centre bodies of great weight were carried spirally upwards, at the extremities the trees were thrown in opposite directions. The same circumstance was observed at Barbadoes in 1831, near the northern coast: the trees which the hurricane uprooted lay from N.N.W. to S.S.E., having been thrown down by a northerly wind, while in some other parts of the island they lay from S. to N., having been prostrated by a southerly wind. It is evident, therefore, that the direction of the wind at a particular point affords no indication of the course in which the whole revolving mass of the atmosphere is advancing. Another singular conclusion is, that the rotatory motion of the air, in the northern hemisphere, is in a direction against the hands of a watch; and the reverse in the southern hemisphere, or with the hands of a watch. It is also ascertained, that while the axis of a storm in the North Atlantic has a progressive motion from the equator obliquely towards the north pole, that of one in the Indian Ocean proceeds obliquely from the equator towards the south pole. In the Pacific Ocean, a region of hurricanes, their revolving motion is decisively sanctioned by the evidence which has been obtained respecting them. Mr Williams, the missionary, describes a hurricane at Raratonga, one of the Hervey islands, during which the rain descended in deluging torrents, the lightning darted in fiery streams among the dense black clouds, the thunder rolled deep and loud through the heavens, and the island trembled to its very centre as the war of the elements raged over it. Scarcely a banana or plantain tree was left, either on the plains, or in the valleys, or upon the mountains; hundreds of thousands of which, on the preceding day, covered and adorned the land with their foliage and fruit; and immense chestnuts, which had withstood the storms of ages, were laid prostrate on the ground, while those that remained erect had scarcely a branch, and were all leafless. It was observed, that when the gale ended, the wind was in the west, whereas in the early part of its action the east end of the chapel had been blown in, which shows the wind then to have been in the east. The hurricanes of New South Wales have been observed to develop the same peculiarity. Mr. Meredith traced the path of one in the centre, and found at the termination a circle plainly shown, in which the trees lay all ways. The cause of this rotatory motion of storms remains in obscurity, but it is probably due in part to the same law under which eddies or whirlpools are formed in water, by two currents being obliquely impelled against each other. The great hurricanes may thus be considered identical with the small local whirlwinds, which are common with us in the summer season, carrying upwards and along the dust and loose grass in spiral columns, exhibiting a progressive and rotatory motion. In the region of the sandy deserts these atmospheric whirls transpire upon a great scale, raising up immense quantities of the loose particles in columns to a considerable height, which sweep along with prodigious violence, and have occasionally swallowed up whole caravans in their tremendous vortex. "Man mounts on man, on camels camels rush, "One of the largest of these pillars of sand," says a modern traveller, Caillie, "crossed our camp, overset all the seats, and whirling us about like straws, threw one of us on the other in the utmost confusion. We knew not where we were, and could not distinguish anything at the distance of a foot. The sand wrapped us in darkness like a fog, and the sky and the earth seemed confounded and blended in one. Whilst this frightful tempest lasted we remained stretched on the ground motionless, dying of thirst, burned by the heat of the sand, and buffeted by the wind. We suffered nothing, however, from the sun, whose disk, almost concealed by the clouds of sand, appeared dim and deprived of its rays." Bruce has sketched with spirit several of these desert whirlwinds of which he was an eyewitness: "At one o'clock," he states, "we alighted among some acacia trees at Waadi el Halboub, having gone twenty-one miles. We were here at once surprised and terrified by a sight, surely one of the most magnificent in the world. In that vast expanse of desert, from W. to N. W. of us, we saw a number of prodigious pillars of sand at different distances, at times moving with great celerity, at others stalking on with a majestic slowness; at intervals we thought they were coming in a very few minutes to overwhelm us; and small quantities of sand did actually more than once reach us. Again they would retreat so as to be almost out of sight, their tops reaching to the very clouds. There the tops often separated from the bodies, and these, once disjoined, dispersed in the air, and did not appear more. Sometimes they were broken in the middle, as if struck with large cannon shot. About noon they began to advance with considerable swiftness upon us, the wind being very strong at north. Eleven of them ranged alongside of us about the distance of three miles. The greatest diameter of the largest appeared to me at that distance as if it would measure ten feet. They retired from us with a wind at. S. E. leaving an impression upon my mind to which I can give no name, though surely one ingredient in it was fear, with a considerable deal of wonder and astonishment. It was in vain to think of flying; the swiftest horse, or fastest sailing ship, could be of no use to carry us out of this danger; and the full persuasion of this rivetted me as if to the spot where I stood. The same appearance of moving pillars of sand presented themselves to us this day in form and disposition like those we had seen at Waadi Halboub, only they seemed to be more in number and less in size. They came several times in a direction close upon us, that is, I believe, within less than two miles. They began His rays immediately after sunrise like a thick wood, and almost darkened the sun. shining threw them for near an hour, gave them an appearance of pillars of fire. Our people now became desperate; the Greeks shrieked out and said it was the day of judgment; Ismael pronounced it to be hell; and the Turcorories, that the world was on fire." The procession of tall columns of dust, the upper end seeming to vanish off, or puff away like light smoke, and the lower apparently touching the earth, is not unusual on the large plains of New South Wales, in dry weather. They move in a perpendicular position, quietly and majestically gliding along one after another, but really so fast that the fleetest horse is unable to keep pace with them. According to Mrs. Meredith, when they are crossing a brook, the lower portion of the dust is lost sight of, and a considerable agitation disturbs the water, but immediately on landing the same appearance is resumed. "As some vanish," she remarks, "others imperceptibly arise and join the giant waltz; and when I first observed this most singular display, I amused myself by fancying them a new species of genii relaxing from their more laborious avocations, and having a sedate and stately dance all to themselves. When the dance ends, these dusty performers always appear to sit down among the neighbouring hills." To the same class with these rotating and progressing pillars of sand, that singular phenomenon called the waterspout clearly belongs, a whirlwind raising into a columnar mass the waters of the sea, and causing the aqueous vapours in the atmosphere to assume the same form, the two frequently uniting, the whole presenting a magnificent spectacle. The Greeks applied the term Prester to the waterspout, which signifies a fiery fluid, from its appearance being generally accompanied with flashes of lightning, and a sulphureous smell, showing the activity of the electrical principle in the air. Lucretius refers to it in the following terms: Boiling amain beneath its mighty whirl, And with destruction sure the stoutest ship Threat'ning that dares the boist'rous scene approach." Waterspouts exhibit various aspects, but a frequent appearance has been thus described, as it has been observed at sea. Under a dense cloud, a circular area of the ocean, in diameter from 100 to 120 yards, shows great disturbance, the water rushing towards the centre of the agitated mass, from whence it rises in a spiral manner towards the clouds, assuming a trumpet-shape, with the broad end downwards. At the same time, the cloud assumes a similar form, but the position of the cone is inverted, and its lower extremity, or apex, gradually unites with the upper extremity of the ascending column of water. At the point of junction, the diameter is not more than two or three feet. There is thus a column of water and vapour formed, extending from the sea to the cloud, thin in the middle, and broad at the two extremities, the sides of which are dark, which gives it the appearance of a hollow tube. It moves with the wind, and even in calm weather, when no wind is perceptible, the position shifts. Sometimes the spout preserves the perpendicular in its motion, but frequently, from the wind not acting with equal force upon its upper and lower extremities, or the one being more susceptible of impulsion than the other, it assumes an inclined position, and the column is speedily ruptured by the unequal velocity of its parts. A few minutes suffices in general for the duration of the phenomenon, but several have been known to continue for near an hour. Instances of repeated disruption and formation have been witnessed, and in the Mediterranean, as many as sixteen waterspouts have been observed at the same time. The mariners of former days were accustomed to discharge artillery at these moving columns, to accelerate their fall, fearful of their ships being crossed by them, and sunk or damaged-a practice alluded to by Falconer in the opening of the second canto of The Shipwreck: but the principal danger arises from the wind blowing in sudden gusts in their vicinity, from all points of the compass, sufficient to capsize small vessels carrying much sail. Waterspouts on land are not uncommon, and in this case there is no ascending column of water, but only a descending inverted cone of vapour. Vivid flashes of lightning frequently issue from them, and deluges of rain attend their disruption. A remarkable spout appeared and burst on Emott Moor, near Coln in Lancashire, in the year 1718, about a mile distant from some labourers digging peat, whose attention was directed to it by hearing an unusual noise in the air. Upon leaving the spot in alarm, they found a small rippling stream converted into a roaring flood, though no rain had fallen on the moor; and at the immediate scene of action, the earth had been swept away to the depth of seven feet, the naked rock appeared, and an excavation had been made in the ground by the force of the water discharged from the spout, upwards of half a mile in length. It is a time of fear and peril to man and beast when the hurricane developes its giant strength, yet, contemplated apart from the probability of some fatal catastrophe, there is no scene more intensely sublime in the varied panorama of nature, than that exhibited to the senses of sight and hearing, by the dense black masses of clouds that roll in wild confusion through the air, the tumultuous aspect of the ocean, the agitation of the woods, and the voice of the tempest, varying from the melancholy wail to the piercingly shrill cry and deafening roar, and occasionally combining every kind of intonation in its sound. However destructive these extraordinary agitations of the atmosphere-however terrible such a situation as that of Æneas on the stormy sea, helpless and hopeless, stretching his folded hands to the stars, and lamenting that he had not fallen with fierce Hector on the Ilian plains—it is unquestionable, that neither "breeze, or gale, or storm," could be dispensed with in the economy of nature; for the various forms of life which the common air sustains, are preserved in vigour by that conflict of the elements which works occa sional disaster. A variety of natural causes in operation upon the surface of the globe, and in its interior, concur to derange that constitution of the atmosphere which is alone salubrious, to vitiate the fluid, convert the medium of life and health into a cause of fever, pestilence, and death, thus changing every scene where the machinery of human existence is in movement into a Grotto del Cane, completely arresting all its wheels—an effect which would undoubtedly transpire without an antagonistic influence in constant action. In the process of supporting mankind and animals, the atmosphere is deprived of its oxygen, and exhaled in a morbid condition unfit for combustion and the sustenance of life; and the respiration of plants contributes also to its derangement. The exhalations from the low swampy regions of the earth are a further cause of deterioration, and hence the malarious mass to which the Pontine marshes, and similar districts, give birth. The provision against the reduction of the atmosphere to a universally disorganised and vitiated condition is the currents that prevail in it, which disperse and separate the poisonous ingredients, render them innocuous by bringing them into new combinations, and thus keep up that due proportion between the component parts of the aerial envelope, upon which its life-conserving property hinges, yet which the functions of life are perpetually destroying. The ordinary play of the winds, whispering in gentle breezes and rushing in powerful gales, has been ordained by the Author of life to subserve this purpose, and the dread tornado is also an efficient agent in the regeneration. In its alembic, it has been remarked, "the isolated poisons will be redistilled; by the electric fires which it generates, their deleterious sublimations will be deflagrated; and thus will the great Alchymist neutralise the azotic elements which he has let loose, and shake the medicinal draught into salubrity." The baneful effects of a stagnant condition of the atmosphere are exemplified in the feeble physical frame, and short term of years, of those who in the "city full" are cooped up in sites were there is no sufficient ventilation, and the inhabitants of many deep enclosed valleys exhibit physical and mental deterioration as a consequence of the same cause. The numerous examples of crétinism, or idiocy, with goîtres, found about the villages and hamlets of the Lower Valais, and the Val d'Aosta in Switzerland,-valleys, which have low marshy spots at the bottom, surrounded by high mountains, where the fresh air does not circulate freely, and where the reflected rays of the sun are very powerful in summer,-Saussure attributed to the stagnation of the atmosphere; and though such instances of physical deformity and intellectual incapacity may be the combined effect of various causes, it is in harmony with the known effect of the one referred to, to suppose it materially to contribute to the result. The cagots of the deep Pyrenean valleys answer to the cretins of the Alps. In closing this notice of atmospheric currents, we refer to observations made upon the ordinary winds of Great Britain. From an average of ten years of the register kept by order of the Royal Society, it appears that at London the wind blows annually in the following proportions: The same register shows, that the south-west wind blows at an average more frequently than any other wind during every month of the year, and that it blows longest in July and August; that the north-east blows most constantly during January, March, April, May, and June, and most seldom during February, July, September, and December; and that the north-west wind blows oftener from November to March, and more seldom during September and October, than any other months. At Bristol, the south-west winds are |