Chemistry and Physies. 215 
larly treated, using tartaric, citric, and lactic acids respectively in 
place of sa alicylic. In the salicylic solution, the roots were killed. 
c 
not even by planting in earth. Fifteen grains of corn were soaked 
in water containing rg4qq Of pret tans em and then placed in a 
F. B, 
7. Outlines of Prowimate Organie Analysis; by Ausert B, 
Prescorr, Professor of Organic and Applied Prcclaiey in the 
Univer ‘sity of Michigan, 192 pp. 12mo. New York, 1875 (Van 
Nostrand).—This work is a useful and much n eeded laboratory 
manual, for the Sientficaton. separation, and qua alitative deter- 
by a manual of es “ Chemical ese ate ‘of Alcobolic Liquors,” 
by the same autho 
. Passage of eat through Liquid Films. Br gs F. Exy 
has determined spit peptaagte the penetration of various Shae 
through the film of a soap bubble, an effect shown casas 
— 
1:95. Illuminating gas = 2:27, H=3°77, CO*=47:1, H,S=651, 
NH, =46,000. ithin these extraordinarily wide limits, ‘between 
0°86 and 46 ,000, the observations are in perfect accord with the 
formula Ts Experiments were also made for the purpose of 
ascertaining the absolute velocity of diffusion, These gave for 
the diffusion of H in air through a soap film, that in one minute 1°88 
