418 Scientific Intelligence. 
netism or diamagnetism of the substance, and secondly upon the manner 
in which either force is modified by the th iehe structure of the crystal. 
a of wih vite: If these views be correct, the optical axis can no 
regarded as the prime agent in the production of the phe- 
nomena which we have been cons idering ; ; we shall no longer seek the 
explanation of new facts in the hypotheses of new forces, but rather 
in rape oom of old. 
Marburg, January, 
2. a8 senic in he ‘sepivi from Mineral Waters; by M. J. L. Las- 
SAIGNE, (Journ. de Chem. Med., Sept., 1849; Phil. Mag., Dec., 1849.) 
—The large quantities of arsenic recently discovered in certain ‘chalyb- 
ate waters, have made it a matter of much interest to determine the 
state in which the arsenic exists, and its effects upon the animal 
y- 
The deposit from the waters of Warevitliet (Haut Rhine) yielded 4°42 
r cent. of arsenic acid, equivalent to per cent. metallic arsenic. 
orty grammes (about 600 grains) of this deposit were administered to 
a dog in two doses, the animal showed not the slightest uneasiness, ate 
as usual, and, in short, was hae by a dose equivalent to 26° 52 
grains arsenic acid or 16°8 grains metallic arsenic. 
rom this and another Siiievichecth of similar character, the author 
infers, that the poisonous property of the arsenic is destroyed in these 
freshly sisi tated oxyd and the dry could be svat: 
. C. SCHAEFFER. 
to appear. The outside of the crucible being cleaned it is to be in- 
verted over a sheet of paper, and if any of the contents adhere they 
may be removed with a feather. The carbonaceous mass is then grad- 
ually added to 3 parts nitric acid, sp. gr. 1:20, ina convenient flask, 
and the solution is completed by a gentle heat. 
