XVII. 
XVIII. 
XIX. 
XX. 
Ot. 
XXII. 
XXII. 
XXIV. 
CONTENTS. 
On the Reduction of Observations of Underground Temperature ; with 
Application to Professor Forbes’ Hdinburgh Observations, and the 
continued Calton Hill Series. By Professor W1LL1am THomson, 
On a Method of Reducing Observations of Underground Temperature, 
with its Application to the Monthly Mean Temperatures of Under- 
ground Thermometers at the Royal Edinburgh Observatory. By 
JosEPH D. Everett, M.A., Professor of Mathematics, &c., in 
Kine’s College, Windsor, N.S. Communicated by Professor 
W. THomson, 
PART III. (1860-1.) 
On a Mode of Taking the Density of Vapour of Volatile Liquids at 
Temperatures below the Bowling Point. By Dr Lyon Puayrarr, 
C.B., F.R.S., and J. A. WAnxKLYN, F.R.S.E., 
The Bifilar Magnetometer, its Errors and Corrections, including the 
Determination of the Temperature Coefficient for the Bifilar employed 
in the Colonial Observatories. By JouN ALLAN Brown, F.RB.S., 
Director of the Trevandrum Observatory. Communicated by 
Professor Tarr, 
Fragmentary Notes on the Generative Organs of some Cartilaginous 
Fishes. By Joun Davy, M.D., F.R.S. Lond. and Edin., &c. 
(With one Plate, XXII.), : ; 
Some Observations on the Albino. By Joun Davy, M.D., F.R.S. 
Lond. and Edin., &c., : ; ; 
On the Horizontal Force of the Earth's Magnetism. By Joun ALLAN 
Broun, F.R.S., Director of the Observatories of His Highness 
the Rajah of Travancore. (With Six Plates, XXIII—XXVIII.) 
Communicated by Professor Tarr, : : ; : 
On the Pediculi infesting the Different Races of Man. By ANDREW 
Murray, Esq., of Conland. (With two Plates, X XIX. and 
XXX.) Communicated by Professor ALLMAN, 
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