INDEX 
TO THE 
PHILOSOPHICAL TRANSACTIONS 
FOR THE YEAR 1861. 
A. 
Absorption of heat by gases and vapours, 1. 
Admiralty Standard Compass, investigations respecting, 161 (see Smith). 
Annulosa, generative organs in the, 595 (sec Lubbock). 
Arachnida, generative organs in the, 610 (see Lubbock). 
Arbogast’s method of derivations, on an extension of, 37. 
Arsenious acid, separation of, 217. 
B. 
Bakerian Lecture, 1 (see Tyndall). 
Boussingault (M.), notice of his experiments on the assimilation of nitrogen by plants, 418 (see Lawes). 
Boyd (Dr. R..). Tables of the Weights of the Human Body and Internal Organs in the Sane and Insane 
of both Sexes at various Ages, arranged from 2314 post-mortem examinations, 241. 
C. 
Carbonic acid, properties of liquid, 83. 
Carrington, temporary bright solar spots seen by Mr., collated with magnetic disturbances, 426. 
Cayley (A.). On an Extension of Arbogast’s Method of Derivations, 37. 
On the Equation for the Product of the Differences of all but one of the Roots of a given 
Equation, 45. 
MDCCCLXI. 5 U 
