Metallurgy. 129 
forming a anes readily fusible double silicate with the silica contained 
in the hem 
The method pursued to detect titanium was the same as that adopted 
and oh in my paper in the Journal of the Chemical Society for 1862, 
age 3 It, however, required no very special method to point out 
titanic acid was obtained, which gave the reactidns peculiar to titanic 
acid in the blowpipe flame with microcosmic salt. ‘The whole of the 
titanic acid cannot be rope with the silica, and a considerable 
amount is in solution with the ir However, to de termine accurately 
* The following are eg ree have been adopted to yee the titanic acid: 
—A weighed portion 0 Boy borings of the pig are treated with fuming nitric acid 
ina flask, a few drops o f chiothydre acid added from time ‘ tne, the whole 
being well boiled. The contents of the flask are then transferred into a por 
dish, evaporated to dryness, and heated strongly. ral igri it yt be found cha 
oxyd of iron readily detaches aes from the dish, a n be easily t iy and 
poured on the contents of the ated the di h may 
strong chlorhydric acid. The contents of the beaker are 4s bollé a for or got Mth = 
hree hours until complete solution of the iron is effected; and as some ninntity of 
chlorhydric acid is required for this, my usual plan is to allow a large portion of 
si ; 
0 
tained very nearly white after sh ge! off the graphite, and very little iron will be 
found with it except the pig contain much phosphorus, as the silica invasiehly ie 
tains more or less phosphate of i ke! from insoluble ce sphid o' yo which ca 
driven off by boiling. The solution is then nearly neutralized with ammonia, a 
acetate of ammoma or soda added; and if there is only a a small quantity of phos- 
phoric acid, there will always be sufficient peroxyd of iron to precipitate it, but if 
itri a 
Am. Jour. Scr,—Szconp Serres, Vou. XXXVI, No. 109.—Jay., 1864. 
17 
