254 Correspondence of J. Nickles. 
being regenerated, and forming with the excess of RO, 
eens ‘ Se:O.s. The latter view seems to be the more prob- 
able, as the salts obtained both from the bromine and chlo- 
rine bodies were exactly similar in physical properties to the salts 
of the simple acid. ; 
5thly. In the body obtained by the continual action of nitric 
from selenethyl there seemed to be also a close analogy between 
selenium and tellurium: thus selenium appears in its organic 
compounds of the alcohol series to fulfill the functions both of 
sulphur and tellurium, and may justly be regarded as the con- 
necting link between these bodies. 
Art. XXX.—Correspondence of M. Jerome Nicklés, dated Paris, 
January 5, 1856. 
i 
optics, important researches on mechanics, and in particular, a re- 
markable theorem on the variation which force undergoes when a sud- 
en change is given to the parts of a system in motion. 
Sturm entered the Institute in the place of Ampére, and in many Te- 
spects he resembled him. He was, like him, candid, indifferent to the 
wealth and show of the world, gified with an inventive mind united 
is family was attaching him most strongly to life. 
t long since, in giving an account of the toxical 
oxyd,* that M. Chenot was the first to try them; 
* This Journal, Jan. 7, 1854, p. 120. : 
; 
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