282 Scientific Intelligence. 
It is then boiled, filtered and the precipitated phosphate of bismuth is 
washed with hot water, dried, ignited and weighed. Chlorine and sul- 
phuric acid, if present, must first be removed by means of the nitrates of 
baryta and silver. Too great an amount of nitric acid must be avoided, 
of iron, as manifested by the color of the precipitate, which was sets 
red when a large proportion of iron existed in the solution and of a ye 
low tint when the amount of iron was small. : 
_A strong solution of nitrate of alumina was prepared by estate 
nitric acid (of sp. gr. 1:16) with pure, freshly precipitated hydrate 
alumina, and some experiments were made with this solution, = ss 
0 
