Chemistry and Physics. 165 
determined by ferrocyanide. For 0°1425 grm. of copper used in 
six experiments the process gave 0°1425 grm. in four and 01420 
mtwo. In the case of cadmium, 071235, 0°1480, 0°2385 grms. were 
used and 0°12325, 0°1470 and 0-2380 recovered. For the separa- 
lion of iron and copper, solutions of iron alum and copper sulphate 
Were mixed with ammonium oxalate in excess, and electrolyzed. 
fter the copper was separated, more a ium oxalate was 
latinum is readily estimated quantitatively by electrolyzing its 
Solution in h ydrochloric acid or ammonium oxalate with a current 
of half the above strength. The author gives the results of the 
electrolytic separation of iron from eobalt, nickel, zine and 
uranium, of zinc from chromium and uranium, of cobalt from 
chromium, all of which are accurate.— Ber. Berl. Chem. Ges., xvii, 
2467, Nov. 1884, G. F. B. 
,.: On the Specific Gravity of Monohydrated Sulphuric actd.— 
Ss reviewed all the determinations which have 
re @ tube is then sealed, inverted and slowly heated in a water bath. 
tate nation takes place and two layers of liquid appear in the 
Ka - By slow cooling, beautiful well-formed crystals separate 
: om the lower layer, apparently quadratic in form. The tube is 
°W opened and the still liquid oxide poured off. It is then again 
Sealed, heated to fuse the crystals, allowed to cool and the liquid 
a ; 
. a - ‘J, of KSO.. (50). 
ge with rubidium, cesium, ammonium and thallium. 
tum and silver did not appear to form them, at least not 
Uy.—Ber. Berl. Chem. Ges., xvii, 2497, Nov. 1884. 
Am. Jour. Sci.—Tuirp Serres, Vou. No. 170.—Fes., 1885. 
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