Chemistry and Physics. 63 
whose ets weight is high. Its symbol is Yb.— C. = ee 
578, Oct., 1878. 
5. Ona Simple Vapor density Method.—Vicror Miargied ‘hse 
roposed a very simple mode of approximate vapor density de- 
is to be closed with a cork. Tou é, the. a minora is placed in 
the vapor of a liquid of suitteienithy’ high boiling point, or even in 
a metallic bath. “After the temperature has become constant and 
bath are needed in the daloutatiit This requires only the 
weight of the substance, the temperature of the room, the height 
the barometer and the volume of air expelled. ‘The results 
_ are close enough for randrnt weight determinations, as the fig- 
_ ures given show.— Ber. Berl. Chem. Ges., xi, 1867, Nov., tbe 
F, 
: 6. On the Separation of Zine | from Nickel. —BEtsrein ex 
_ proposed the use of citric acid in the analytical separation of 
: On he formation of Purpureo-chromium salts. —JoRGENSEN 
; te Baines by the oxidation of an ammoniacal solution of 
