Chemistry and Physics. 123 
It is without action upon vegetable colors, but combines with acids 
forming salts which crystallize beautifully ; the hydrochlorate of thi- 
aldine is formed by dissolving the alkaloid in the dilute acid ; it crys- 
tallizes in prisms, is readily soluble in water but insoluble in ether; it 
contains C,,H,, NS, HCl. The nitrate is obtained in delicate needles 
when an ethereal solution of thialdine is agitated with nitric acid; its 
formula is C,, H,, NS,, NHO,. 
By the action of scleniureted hydrogen upon a solution of aldehy- 
date of ammonia, the authors obtained small crystals of an alkaloid 
which contained selenium; they regard it as analogous to the last and 
have named it selenaldine, but from the facility with which it is decom- 
posed by the air, they have been unable to make a proper examina- 
ion of it 
[This sulphureted alkaloid evidently corresponds to a normal 
species C,, H,, NO,, which will be an amidized derivative of elalde- 
lyde, in which the residue NH replaces O,. If we consider the changes 
as consecutive, the first step will be the union of three equivalents of al- 
dehyde to form one of its polymere elaldehyde, which reacts wi 
equivalent of ammonia, forming with the elimination of the elements 
of two equivalents of water, the body C,, H,, NO,; this by the ac- 
tion of sulphureted hydrogen exchanges its oxygen for sulphur. 
~The normal species will be a homologue of glycocoll, and it appears 
to me very probable that it is no other than leucine. This substance 
which is formed by the action of sulphuric acid or potash upon gelatine 
and fibrine, combines with acids like an alkaloid, and the nitroleucates 
his analysis of leucine has deduced the formula C,, H, ; 
this is anomalous as presenting an even number of equivalents of hy- 
en with one of nitrogen. But if the formula is C,, H,, NO, the 
anomaly disappears, and in the analysis of a body of so high an equiv- 
alent, a very small error in the per-centage of the hydrogen is suffi- 
cient to make the difference. ] eS. Het 
, 12. On Perchromic Acid ; by M. Barreswitt, (Ann. de Chem. et 
de Phys.)—Concentrated solutions of chromic acid and peroxyd of hy- 
drogen, when mixed, produce violent efferve from the escape of 
pure oxygen ; on the contrary, when the solutions are very dilute the 
mixture becomes intensely blue, but the color-is very unstable and evi- 
dently belongs to a peroxyd of chromium. Every attempt to isolate 
_ this substance failed. std 
oxygen was measured, and the composition of the blue substance deter- 
mM 
O, requires H=923 and in Cy2 H,, NOy, H= 
utters eoaipaia dam unable to compare these num- 
BHR area Hee oe ee ' oe 
oe Fhe Brau C, A 
992; not having access to M 
} 
