Chemistry ana Physics. 485 
and hyoscine on boiling with -nlapbepaatics acid; and also that 
atropine, thus treated, breaks up i tropic ac id and tropine. 
ome time ago, LADENBURG sailed. attention to the very close 
similarity between hyoscinic and tropic acids. He now shows 
that there is the same relation between "hiyosoine and tropine, 
these two bodies being identical. Their platinum chlorides have 
numbers on analysis. The curious fact now appeared that two 
isomeric alkaloids gave identical decomposition products. To 
test the matter synthetically three experiments were made: (1) 
Tro ine from atropine and hyoscinic acid from daturine were 
treated with Lar acid on the water bath ; (2) Hyoscine 
from hyoseyamine and tropic acid from atropine ‘were thus 
min - 
due, after neutralization and extraction with alcohol, was dissolved 
in hydrochloric acid, and precipitated with, “ene o ape: In 
conversion of hyo it ia into atropine.——Ber. e8., 
xiii, 607, April, 18 : * 
6. On the pw of the Oxidation of Albumin by gr ah 
gangte.—The question whether by the direct oxidation of aibaaen, 
urea is produced, has been an open one. LossEN has now repeated 
with care the experiments of Béchamp and others, 500 grams of 
purified egg-albumin being diffused in 400 c.c, of water containing 
when they are modified to embrace ‘he new ¢ condition of a motion 
of the medium through which the light passes. Suppose that the 
dielectric moves with a velocity wu in the direction of the propaga- 
tion of the light. Let V be the velocity of awe Ee light 
in the dielectric when it is at rest ; the author finds © =-=— oo V 
approximately. In which 4 is the dled of PANE of light | 
in the medium. The conclusion is, therefore, drawn that the 
velocity of the light is increased by pre half the velocity of the 
dielectric. — Phil. Mag., April, 1880, iS, 
8. Suggestions in regard to Cry  coktaabin. —Mr. 8. Totver 
Preston discusses crystallization under the following assumptions: 
