INDEX 
TO THE 
PHILOSOPHICAL TRANSACTIONS 
FOE THE YEAE 1864. 
A. 
Absorption and radiation of heat by gases, 201, 327 (see Tyndall). 
Alloys, influence of temperature on the electric conducting-power of, 167 (see Matthiessen). 
Amphigenous surface, 629 (see Sylvester). 
Aniline, action of nitrous acid on, 668 (see Griess). 
B. 
Bakerian Lecture, 327 (see Tyndall). 
Benzidine, action of nitrous acid on, 719 (see Griess). 
Boole (G.). On the Differential Equations which determine the form of the Roots of Algebraic Equa- 
tions, 733. 
Brain of Bushwoman, and of idiots, 501 (see Marshall). 
Bushwoman, brain of, 501 (see Marshall). 
C. 
Cayley (A.). On Skew Surfaces, otherwise Scrolls, 559. 
Clusters of stars, catalogue of, 1. 
Conducting-power, electric, of alloys, 167 (see Matthiessen). 
D. 
Biazobenzol, 668 (see Griess). 
Diazobromobenzol, 695. 
5 i 
MDCCCLXIV. 
