Chemistry and Physics. 403 
nickel which were obsained in this way have a i commas sae 
malgam. an 
of the metals are formed. e examined the salts formed wit 
barium, lead, mercury, silver, thallium and lithium, using precipi- 
tation for their preparation in all but the latter case. With bari- 
um, lead, and mercury, only the normal chromate R’CrO,, could 
be cheaned, either by oa gee with Lege rage dis mate or 
dea ve omic 
and dichromate of lithium are well crystallized | salts, the former 
having a pure yellow, the latter a dark orange, almost black color. 
Each has two molecules of crystal water, both a 5 barge aes 
pi lose their crystal water at 130°.—/. pr. Ch., Il, xix, > 36, Jan 
1879. 7 
4, On the Purification of Mercury.—Briut has propored to 
use alsa acid for the purpose of purifying mercury, and has 
freed twenty-five kilograms of mereury from Wood's fusible metal 
with which it was contaminated, in two hours by its means. Five 
into small globules, a little red chromate being form agi- 
tation is a until this red powder has OE and the 
Solution has becom n. By: a strong current of water, a gray 
powder of metallic pede is washed away, and the process is re- 
