Chemistry and Physics. 61 
or pure silver. No thermo-electric current has been shown to: 
exist between unequally heated portions of pure mercury. The 
author has investigated the thermo-electric relations between 
amalgams of mercury and other metals, and finds the following 
thermo-electric series for amalgams of 0°5 portions by weight of 
the following metals with 100 parts of mercury: tin, silver, lead, 
zine, cadmium, bismuth.— Ann. der Physik und Chemie, No. 11,. 
1884, pp. 447-476. J. T. 
5. Klementary Text-book of Physics ; by Professors Wii11aM 
A. Axtuony and Cyrus F. Brackert, art I, 246 pp. 8vo. 
New York, 1884. (John Wiley & Sons.)—The appearance of a 
import- 
tirely consistent with the size and apparent object of the book. The 
learner is told that only simple mathematics are required, and 
yet he is soon introduced to the differential coefficient, and ex- 
pected to understand the idea of summation. The nature of heat 
8 regarded as satisfactorily explained by the statement that it is “a. 
form of energy,” and yet nothing is given in the earlier 
part of the volume from which the student can learn what the 
explain the fundamental principle of modern physics is very 
Incomplete. : 
Indexes to Chemical Literature. —The Committee ‘on 
