394 Prof. VV. N. Hartley and Mr. II. Ramage. 



from these and heated in the oxyhydrogen flame, gave the gallium 

 line \ 4171/6. The ingots were exceedingly hard, and practically 

 resisted all attempts to reduce them to small pieces. One ingot, 

 weighing 210 grams, was boiled with hydrochloric acid, until its 

 solvent action on the metal had nearly ceased, when the liquid was 

 decanted, and fresh acid poured on. The process was very slow, and, 

 after 80 grams had been dissolved, the remaining piece of metal was 

 scraped, to remove an adhering layer of carbonaceous matter, and 

 the analysis of the products proceeded with. The liquid was filtered, 

 and the black residue A washed. The filtrate was evaporated, to 

 expel the excess of hydrochloric acid, water was added, and the solu- 

 tion, not being clear, was filtered. The residue B thus obtained had, 

 when dry, a dark greyish colour. Residues A and B. 



In the clear filtrate two rods of zinc were immersed, and during a 

 period of one hour and three-quarters hydrogen was evolved, and 

 metals were deposited on the zinc. The deposit was scraped off, and 

 separated from the liquid by filtration. Metallic deposit G. To the 

 filtered solution were added about 4 c.c. of lead acetate solution, and 

 two rods of zinc were placed in the liquid, according to the method 

 of Lecocq de Boisbaudra.n,* by which, as the lead is precipitated, 

 traces of other metals, such as copper, silver, indium, thallium, &c., 

 are collected by the lead. Metallic precipitate F. 



Fractional Precipitation by Ammonium Acetate. The filtrate, in 

 volume about 2 litres, was boiled, but as no precipitate formed, 15 c.c. 

 or thereabouts of a solution of ammonium acetate were slowly added, 

 and the solution boiled ; the iron, being in the ferrous state, was 

 retained in solution, whilst it was expected that the gallium would 

 be precipitated as phosphate. After boiling for about twenty minutes, 

 the substances precipitated were collected on a filter and washed. 

 Residue D. 



The filtrate was again boiled with about 10 c.c. of ammonium 

 acetate, and the precipitate collected on a filter. Residue E. 



Further Precipitation of Basic Acetates. The filtrate from E was 

 again boiled with ammonium acetate, the resulting precipitate being 

 filtered off. It was much darker in colour than those previously 

 obtained. Sesquioxide metals G. 



The filtrate was evaporated until it became a saturated solution of 

 ferrous chloride. It was allowed to cool and crystallise, and the 

 operation was repeated upon the mother liquor. The two crops of 

 crystals were mixed with others, which were obtained as follows. 

 The solution from the remaining portion of the 210 grams of 

 metal was filtered, and the filtrate evaporated. It was then allowed 

 to cool and crystallise. The mother liquor was concenl rated, and 

 again allowed to cool and crystallise, the different crops of crystals 

 * ' Spectres Lumineux.' 



