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27°61, his results being corrected for the new equivalents of silver and 
chlorine. Von Hauer adopts 27-5 as the true equivalent. [This number 
differs remarkably from that determined by Dumas who found 26.] 
The same chemist has also determined the equivalent of tellurium by de- 
termining the quantity of bromine contained in the crystallized bromid of 
tellurium and potassium KBr+TeBr2. The mean of five experiments 
gave 64:03 which corresponds with the new equivalent of Dumas. 
Schneider has determined the equivalents of cobalt and nickel by 
analyses of their oxalates, the relative quantities of carbon and metal 
being found, the former by the usual methods of organic analysis, the 
latter by oxydation and subsequent reduction in a current of pit 
In this manner the equivalent of cobalt was found to be 30 and that o 
nickel 29, each a mean of four analyses.— Von Hauer in Chemisches Cen- 
_ tral Blatt, Nos. 56,57, 1857. Schneider in Po 
[Nore, Very numerous and carefully made an 
ammonia-cobalt bases executed in my laboratory indicate 29°5 
equivalent of cobalt, and, to say the least, render a re-investiga 
subject very desirable.—w. a. h 
On the preparation of pure compounds of Cerium.—BuNsEN 34 
given a method of preparing the compounds of cerium free from Jantha 
. Ann., ci, 387. 
alyses of the salts of the 
as the true 
tion of the 
stronger base. The simplest mode of applying the principle ior lantha- 
&e., and 
precipl- 
i" fr 
