Lond. & Ed. and M. RUMKER. In a Letter to Dr Brewster,
Sec. R. S. Edin.-P. 112-116.

This interesting paper contains the elliptic elements of the comet of September 1822. It contains also observations of the transit of Mercury over the Sun, on the 3d November 1822, as observed both at Sydney and Paramatta; and likewise the observations of the Winter Solstice of 1822, and of the comet of Encke.

8. On a Remarkable Case of Magnetic Intensity of a Chronometer. By GEORGE HARVEY, Esq. M. G. S. M. A. S. &c. -P. 117-126.

This ingenious and able paper will be regarded by philosophers as adding very important information to that which has already been laid before the public by Varley, Fisher, Barlow, and Scoresby. Mr Harvey found, by Coulomb's apparatus, that a box chronometer exhibited singular proofs of strong and active magnetism. It contained a remarkable quantity of steel, and every part of it exhibited vigorous polarity. Every screw displayed its influence, and the frame alone contained ten large and several small screws; and the same intense and active magnetic power was exhibited by the chain, the axles of the wheels and pinions, the arbor of the fusee, and the balance of its springs. Mr Cox, the agent for Arnold's chronometer at Plymouth, remarked, when he saw this chronometer, that it appeared nothing less than a magazine of magnets. Mr Scoresby recommends platina, or an alloy of platina, for the balance of chronometers. Gold is said to be considered as well adapted for the balance spring.

9. Remarks concerning the Natural-Historical Determination of Diallage. By WILLIAM HAIDINGER, Esq.-P. 127–147. In this paper, the Green Diallage of Hauy is demonstrated always to be a composition of thin films of Hornblende and of Augite, sometimes pure, sometimes the two species blended with each other. Besides this, the paper contains a description of

some of the most remarkable rocks containing green diallage, and an account of cleavable varieties of Saussurite, and of crystals of Serpentine.

10. Investigation of Formula for finding the Logarithms of

Trigonometrical Quantities from one another. By WILLIAM WALLACE, F. R. S. Edin. and Professor of Mathematics in the University of Edinburgh.-P. 148–167.

11. A proposed Improvement in the Solution of a Case in Plane

Trigonometry. By WILLIAM WALLACE, F. R. S. Edin. and Professor of Mathematics in the University of Edinburgh.-P. 168-170.

In the first of these papers, Professor Wallace has investigated rules for deducing the logarithms of trigonometrical functions from one another. Although the formulæ are only approximative, yet they are sufficiently accurate, and are, from their nature, well adapted to logarithmic calculation. These formula, which are highly useful, are not only new, but are characterised by their simplicity and compactness.

The second paper describes an improved method of solving the case in plane trigonometry, where two sides and the included angle are given to find the third side.

12. Some Notices concerning the Plants of various Parts of India, and concerning the Sanscrita Names of those Regions. By FRANCIS HAMILTON, M. D. F. R. S. & F.A. S. Lond. & Edin.-P. 171.

is

This interesting paper contains an account of Dr Francis Hamilton's botanical tour in India. The object of the paper to put upon record an account of the opportunities which he enjoyed of making observations on the botany of India, during his residence in that country, with the view of explaining to the botanist where he may find the various collections which he made in different districts. The botanical observations which our author made in India will immediately appear. The paper is illustrated with a map of India according to the ancient divisions used in the Sanscrita language.

13. On a New Species of Double Refraction, accompanying a remarkable Structure in the Mineral called Analcime. By DAVID BREWSTER, LL.D. F.R.S. Lond. & Sec. R. S. Ed. -187-194.

An abstract of this paper is already given in this Number, p. 255.

14. On the Specific Heat of the Gases. By W. T. HAYCRAFT, Esq.-P. 195-216.

The experiments contained in this paper seem to have been conducted with great care, and great attention to accuracy, in every particular. The results which they seem to authorise, are, that all the gases examined, viz. oxygen, hydrogen, carbonic acid, azote, and carburetted hydrogen, have all their specific heats in the mean proportion of their specific gravities; that different states of combination of the gases with aqueous and other vapour, affect the capacities of the gases, and that probably, in some instances, in a regular arithmetical progression, corresponding with the arithmetical rate of expansive force of the gases, in different states of combination with vapour. The most interesting result to the physiologist is, that the air from the lungs has a less specific heat than atmospheric air, at a temperature of between 100 and 95°. The air of respiration, at a temperature of 102° and upwards, and of 91° and downwards, had the same capacity as atmospheric air.

15. On the Forms of Crystallisation of the Mineral called the Sulphato-tri-Carbonate of Lead. By W. HAIDINGER, Esq. F.R.S.E.-P. 217-230.

An abstract of this paper is already given in this Number of the Journal. Independent of the mineralogical results which are given in this elaborate examination of the Sulphato-tri-Carbonate of Lead, it establishes, beyond a doubt, the accuracy of Dr Brewster's law relative to the connection between the primitive forms of minerals, and the number of their axes of double refraction, which Mr Brooke had called in question from an imperfect examination of the sulphato-tri-carbonate of lead.

ART. XXVII.-Celestial Phenomena from April 1. to July 1. 1824, calculated for the Meridian of Edinburgh, Mean Time. By Mr GEORGE INNES, Aberdeen.

The times are inserted according to the Civil reckoning, the day beginning at midnight.—The Conjunctions of the Moon with the Stars are given in Right Ascension.

On the 5th of April, the Moon will Eclipse the planet JUPITER.

Immersion, April 5, 23h 9′ 39′′,0 at 3′ 13′′,9 S.

0 4 23,6 at 3 33,6 N.

}

of the D's centre.

The following are the Elements for this Occultation, as obtained from Dg LAMBRE'S Tables of the Sun, Burckhardt's Tables of the Moon, and BouvARD'S Tables of 1821 for Jupiter:

Geocentric conjunction of the 》 and 2, at Edinburgh, mean

ART. XXVIII.—Proceedings of the Royal Society of Edinburgh. (Continued from p. 170.)

Jan. 12. 1824. -A Report by the Secretary was read, On the Meteorological Registers kept at Hobart Town and Macquarrie's Harbour, Van Diemen's Land, with observations on the height of the tides, and the time of high water, communicated by his Excellency Sir Thomas Brisbane, K. C. B. &c.

On the same evening, there was read, Observations on a Galvanic Experiment of a paradoxical character, by Professor Oersted. This paper is printed in the present Number, p. 205.

There was also read at this meeting, An Introduction to a History of the Revival of Greek Literature in Italy in the 14th century, by Patrick Fraser Tytler, Esq.

Mr Adie likewise exhibited to the Society the experiment of Professor Dobereiner, of forming water by the action of pulve rized platinum on oxygen and hydrogen.

Jan. 19.-There was read at this meeting, Observations on an Anomalous Case of Vision, by George Harvey, Esq.

At this meeting the following gentlemen were elected members:

HONORARY.

The Rev. John Brinkley, D. D. President of the Royal Irish Academy, &c. &c. W. H. Wollaston, M. D. F. R. S. &c. &c.

FOREIGN.

William Haidinger, Esq.