W. Gibbs—Analytical Notices. 115 
than that which I formerly gave. A little ammonia should be 
added to the solution before filtering. 
nally reduced in hydrogen. The salt employed was pure 
crystallized Co, Cy,.K,. 
(1.) 0°5063 gr. gave 0:0890 gr. cobalt = 17°57%. 
(2.) 06785 or. “ O-1197 gr. “ = 17°644, 
The filtrate, after evaporation to dryness and ignition, gave 
with borax, before the blow-pipe, an extremely faint reaction 
Tn analyses (3) and (4) the solution was boiled with 
¢® in small excess before filtration. ' 
(3.) 0°5332 gr. gave 6°0947 gr. cobalt = 17°76%. 
(4.) 06218 gr. “ O-1101l gr. “ =17°7 
In (5) mercuric chloride was first added to the solution, and 
ot sodic hydrate, until H,@ remained undissolved on 
iling, 
(5.) 0°5855 gr. gave 0°1035 gr. cobalt = 17°68%. 
Proper proportions. The ring has a series of fine openings so 
Placed that the little blue jets of burning gas point radially 
toward its center. The common water-blast may be employed 
