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CONTENTS OF VOL. XXVII.

(FOURTH SERIES.)

NUMBER CLXXIX.-JANUARY 1864.

Prof. Le Conte on the Adequacy of Laplace's explanation to

account for the Discrepancy between the Computed and the

Observed Velocity of Sound in Air and Gases...

Sir David Brewster on the Stereoscopic Relief in the Chimenti

Pictures ..

Mr. G. F. Rodwell on some Effects produced by a Fluid in

Motion

Prof. Tyndall on Laplace's Correction for the Velocity of Sound.

Mr. A. Cayley on an Analytical Theorem relating to the four

Conics inscribed in the same Conic and passing through the

same three Points ....

Mr. A. Cayley on an Analytical Theorem relating to the Sec-

tions of a Quadric Surface....

M. A. Wüllner on the Absorption of Light..

Mr. S. M. Drach on deducing the Parallax of Mars, and thence

that of the Sun, from the former's Geocentric Velocity when

in opposition, and especially near the Node.....

Mr. J. Napier on the Dynamics of the Galvanic Battery

Mr. T. A. Malone on the Gas Battery of Mr. Grove; and its

Theory ..

....

M. A. Colding on the History of the Principle of the Conserva-

tion of Energy

Notices respecting New Books :-

The Rev. R. Main's Practical and Spherical Astronomy,

for the use chiefly of Students in the Universities

Mr. W. T. Lynn's First Principles of Natural Philosophy.

Mr. J. Wharton's Complete Solutions of every class of

Examples in Algebra, forming a complete Course on the

subject, and calculated to facilitate and extend the Study

of Mathematics as a logical Course

Proceedings of the Royal Society :-

Mr. A. J. Ellis on a Simple Formula and Practical Rule

for calculating Heights barometrically without Loga-

rithms....

Proceedings of the Geological Society :-

Herr A. von Koenen on the Correlation of the Oligocene

Deposits of Belgium, Northern Germany, and the South

of England....

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