3. It affords means of increasing the utensils of flames, by placing in them incombustible substances. The intensity of light is greatly increased in burning hydrogen, sulphur, carbonic oxide, &c. by placing in them amianthus or fine wire gauze.

4. It tends to useful inferences, as to the chemical nature of several substances. Thus, ether burns with a flame indicating the presence of olefiant gas, while that of alcohol resembles those of carbonic oxide and hydrogen: hence, the former is probably a compound of olefiant gas and water; the latter, of carbonic oxide and hydrogen.

The phenomena presented, when incombustible substances are seen to tinge flames of various colours, are thus readily explained. The rose coloured tint given to flame by the salts of strontia and lime, the yellow colour afforded by those of barytes, and the green by several borates, depend upon the temporary reduction of the bases of these bodies by the inflammable vapour of the flame, and their subsequent ignition and combustion. Whenever a flame is remarkably brilliant and dense, we may always conclude that solid matter is deposited in it: when, on the contrary, it is very feeble and transparent, we may infer that no solid matter is produced. None of the volatile combinations burn with a flame in the slightest degree opaque: we have reason, therefore, to conclude that no fixed basis exists in sulphur.

5. We may also be able to solve the phenomena of electrical light. It is well known, that the voltaic arc of flame from the great battery, differs in colour and intensity, according to the substances employed to form the circuit; and that it is infinitely more dense and brilliant with charcoal than with any thing else. Sir H. Davy suggests, that this may depend upon the separation of minute particles of the solid charcoal by the electrical attractions; and as the particles of charcoal are infinitely lighter than any other solid body, and the least coherent, they would be separated in the largest quantities.

6. It would appear, that the heat of flames at least, that are communicable to other matters, may be diminished by increasing their light, and vice versa. Newman's blow-pipe affords the strongest illustration of the latter case; its flame is hardly visible by day light, and yet it instantly fuses the most refractory substances exposed to its action. The light from solid matter ignited in it is so vivid, as to be painful to the eye,

It seems, that the application of the compressed gases in this blowpipe, was first suggested by Mr. Children, immediately after Sir H, Davy's discovery that explosions would not extend through capillary tubes. — Journal of Science and the Arts, No. 3.

Meteorology,

The following results are given by Mr. GIBSON, at Stratford; from August 16 to 31st, and by Mr. LUKE HOWARD, at Tottenham, from September 1 to 13, inclusive; viz.

Winds variable in the fore part, westerly in the latter.

Memoirs of the Life and Writings of the late John Coakley Lettsom, M. & LL. D. F. R. S. F. A. S. F. L. S. &c. &c. &c. With a Selection from his Correspondence with the principal Literati of this and foreign countries. By Thomas Joseph Pettigrew, F. L. S. Member of the Royal College of Surgeons; Surgeon Extraordinary to their Royal Highnesses the Dukes of Kent and Sussex; Surgeon to the Universal Dispensary; Fellow and Registrar of the Medical Society; Registrar and Secretary of the Royal Humane Society; Honorary Member and Secretary of the Philosophical Society of London; Lecturer on Anatomy and Physiology, &c. &c. &c.

It is intended to comprise this Work in Three Octavo Volumes, and to publish them by Subscription.

The Two first Volumes will consist of a Memoir of Dr. Lettsom, drawn from original and authentic Sources; and of a Selection from his very extensive Correspondence, principally with the fol lowing distinguished Characters:

Baron Haller
Linnæus

Lord Lansdowne

Lord Buchan

Governor Bowdoin

Sir M. Martin, Bart.

Sir T. G. Cullum, Bart.
Sir Ashton Lever

Colonel Ironside, &c. &c.

Dr. Cullen
Cuming
Currie

Darwin
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A. Fothergill

In order to render this Department of the Work as perfect as possible, the Editor respectfully solicits the communication of such Facts, Documents, and Letters, as may be in the possession of any of Dr. Lettsom's Friends; which will be not only thankfully received, but faithfully acknowledged.

The remaining Volume will contain the Medical Correspondence, and a Collection of Cases, Papers, &c. These will be illustrated by Engravings.

The Work will be published in January next, and the Names of Subscribers (a List of which will be printed) are requested to be sent to the Editor, who will be obliged by as early a communication of them as possible, in order that no delay may be experienced in the publication.

To be Published by Longman, Hurst, Rees, Orme, and Brown, Paternoster Row, by whom also Subscribers' Names will be received.

A new Novel by Miss Holcroft, to be entitled Fortitude and Frailty, in four volumes, is now in the press, and will soon appear.

To be published by subscription, in one volume 8vo. price 12s. in boards, Sermons on the Parables. By the Rev. W. M. Trinder.

Speedily will be published, in a neat portable Volume, A New Grammar of the French Language, on a plan perfectly original, intended for the use of those who wish to acquire a speedy and Grammatical Knowledge of Modern French; interspersed with ingenious Exercises and Examples, illustrative of the peculiar con struction and Idiom of the language; the whole calculated to facilitate the acquirement of Grammatical Knowledge, without the unnecessary fatigue and perplexity of the old system. By Charles Peter Whitaker, formerly of the University of Gottingen, Professor of Languages.

Speedily will be published, in 2 vols. 8vo. with a complete Index, &c. The Lives of Dr. Edward Pocock, the celebrated Orientalist, by Dr. Twells-of Dr. Zachary Pearce, Bishop of Rochester, and of Dr. Thomas Newton, Bishop of Bristol, by themselves; and of the Rev. Philip Skelton, by Mr. Burdy.

Purity of Heart, or the Ancient Costume; a Tale, in one volume, addressed to the Author of Glenarvon, by an Old Wife of twenty years.

W. H. Yate, Esq. will soon publish, in two 8vo. volumes, Fresh Suggestions and Reflections submitted to the Legislature of the United Kingdom.

Early in November will be published, A Treatise on Spherics, comprising the Elements of Spherical Geometry, and of Plane and Spherical Trigonometry; together with a Series of Trigonometrical Tables. By D. Cresswell, M. A. Fellow of Trinity College, Cambridge.

Sermons for every Sunday in the year, including Christmas Day and Good Friday, and commencing with the first Sunday in Advent, for the use of Families and Country Congregations. By the Rev. Richard Warner, of Bath. Will shortly appear.

The Hon. and Rev. E. Turnour has in the press, Sermons on the Union of Truth, Reason, and Revelation, in the Doctrine of the Established Church.

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Dr. Badham is preparing for the press, an Itinerary from Rome to Athens, by the route of Brundusium, the Ionian Islands, and Albania, with classical recollections of the various sites that occur in the journey.

The Rev. Samuel Burdy, author of the Life of Skelton, is preparing a Compendium of the History of Ireland.

S. T. Coleridge, Esq. has in the press, the Statesman's Manual, or the Bible the best Guide to Political Skill and Foresight.

Mr. D'Israeli is printing a third volume of the Curiosities of Literature. He has also nearly ready for the press, a History of Men of Genius, being his Essay on the Literary Character considerably enlarged.

Lord Byron has completed a second part of Childe Harold, which will appear with all convenient speed.

Mr. Ryan has in the press, a Treatise on Mining and Ventilation,

embracing the subject of the Coal Stratification of Great Britain and Ireland.

Poems by the late Edward Rushton, of Liverpool, are preparing for the press.

Memorandums of a Residence in France in the Winter of 181516, including Remarks on Society and Manners, and notices of some works of art not hitherto described, will soon appear in an octavo volume.

A new edition is printing of Whitby on the Five Points in dispute between Calvinists and Arminians, in which the Hebrew, Greek, and Latin quotations are translated.

. Mr. Henry Neile, of Kentish Town, will'soon publish a volume of Odes and other poems.

Miss D. P. Campbell, a resident in one of the Northernmost Isles of Scotland, will speedily publish (by subscription, 10s. 6d.) an octavo volume of Poems, toward the support of a distressed mother, and a younger brother and sister.

III.

WORKS RECENTLY PUBLISHED.

AGRICULTURE.

The Agricultural State of the Kingdom, in February, March, and April, 1816; being the Substance of the Replies to a Circular Letter sent by the Board of Agriculture to every Part of the Kingdom. 8vo. 98. boards.

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Experimental Outlines for a New Theory of Colours, Light, and Vision: with critical Remarks on Sir Isaac Newton's Opinions, and some new Experiments on Radiant Caloric. By Joseph Reade, M. D. Annual President of the Royal Physical, and Meniber of the Royal Medical Societies of Edinburgh, &c. &c. Volume the first. 8vo. 88. boards.

The Journal of Science tution of Great Britain. and E. Prof. Chem. R. I.

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