« AnteriorContinuar »
whirls from east, through south, to west, on the south side of the equator. The sketch at figures 4 and 5, will make this plain to the eye.
The points of the arrow-heads, in fig. 4, show the direction in
N wbich the hurricane revolves in the northern hemisphere. The same in fig. 5, show how it goes in the southern hemisphere. W
any one were standing in the centre of the whirl, the motion would be round him from right to left in the first case, and from
S left to right in the
N second case. The hurricane revolves in the
direction with the hands of a watch, in the southern hemisphere; and in a di- W
E rection opposite to that of the hands of a watch, in the northern hemisphere. This is a very important distinction, because by attending
S to it, and shaping his course the right way, on first falling in with the storm, the sailor now knows how to keep himself clear of its fury, and to sail out of its path, instead of allowing himself to be drawn quite through its centre, as otherwise he would have been almost sure to have done.
No one yet knows exactly how the hurricane is
caused. It is not so easy to unravel its secret mysteries as it has proved to be with other winds. It, however, is obviously formed in strict accordance with some fixed and unfailing law.
This is proved by its whirl always pursuing a determinate direction. It has been remarked, too, that it likes to have its feet in hot water. It is only produced where there
warm ocean-streams immediately beneath, and where, accordingly, abundance of vapour is steamed up into the atmosphere. Another thing, too, is clear. It is not a steady fire which sets going the draught of the whirlwind. It is no simple sun-furnace which invites its giddy and impetuous rush
It is an instantaneous and momentary burst, more of the nature of an explosion, which puts its reeling eddies in movement. In all probability, some large void space is created for a moment, either by intense electrical excitement, or by an extensive and rapid condensation of vapour into water, or by some analogous proceeding, and the entire depth of the atmosphere immediately becomes concerned in filling up the gap, and eflacing the void. The elastic aerial substance, pressed forward by the superincumbent weight of nearly a ton upon every square foot, rushes in from all sides; and having filled up the empty space, then whirls away, spinning off for hundreds of miles, under the exuberant force brought into play. The centre of the eddy is a calm, because the air tends to fly outward from it in all directions, as sparks fly off from a revolving firework, or as waterspray is thrown off from a revolving grindstone. It is the extreme elasticity of the thin aerial substance which leads to all the violence and convulsion experienced in the movements of the winds. When once a small measure of disturbance has been produced, the disturbed particles rush back, and then sway to and fro in a wild, mad way, before they can again settle down into a state of equipoise and rest.
It is the irritable and highly-stretched temper of the invisible air which leads to the “inconstancy of the wind.”
LESSON 55.–PATRIOTISM. SIR WALTER Scott, a voluminous and powerful writer, was born at Edinburgh, 1771. He is celebrated for his romantic poems, The Lay of the Last Minstrel,” “Marmion,” “The Lady of the Lake,” &c., and for his prose romances, “The Waverley Novels.” He was a man of high honour and strict integrity, and he died universally regretted, 1832.
BREATHES there the man, with soul so dead,
This is my own, my native land !
From wandering on a foreign strand !
O Caledonia ! stern and wild,
By Yarrow's stream still let me stray,
(For the poor craven bridegroom said never a word,) “ò come ye in peace here, or come ye in war,
Or to dance at our bridal, young Lord Lochinvar ?" “I long wooed your daughter, my suit you denied ;
Love swells like the Solway, but ebbs like its tide-
Lochinvar.“ The bride kissed the goblet; the knight took it
up, He quaffed off the wine, and he threw down the cup, She looked down to blush, and she looked up to sigh, With a smile on her lips and a tear in her eye.
He took her soft hand, ere her mother could bar,"Now tread we a measure !” said young Lochinvar. So stately his form, and so lovely her face, That never a hall such a galliard did grace ; While her mother did fret, and her father did fume, And the bridegroom stood dangling his bonnet and plume ; And the bride-maidens whispered, 'Twere better by far To have matched our fair cousin with
Lochinvar.” One touch to her hand, and one word in her ear, When they reached the ball door and the charger stood near; So light to the croupe the fair lady he swung, So light to the saddle before her he sprung !-“She is won! we are gone, over bank, bush, and scaur ; They'll have fleet steeds that follow,” quoth young Lochinvar, There was mounting ʼmong Græmes of the Netherby clan; Forsters, Fenwicks, and Musgraves, they rode and they ran; There was racing, and chasing, on Cannobie Lee, But the lost bride of Netherby ne'er did they see. So daring in love, and so dauntless in war, Have ye e'er heard of gallant like young
Sir W. Scott.
LESSON 57.-FITZJAMES & RODERICK DHU.
The Chief in silence strode before,
yore her eagle wings unfurled.
And to the Lowland warrior said :-
Vinch-Alpine has discharged his trust.