O. D. Allen—Hatchettolite and Samarskite. 129 
K,CbOFI,. Then redissolve the latter and collect the former 
on afilter. If the weight of both acids is known, Cb,O, may be 
calculated by difference. On account of the suspected presence 
Of titanic acid in the substance here examined the second crop 
of crystals of K,TaFl, was redissolved in hot water and recrys- 
tallized. No more acicular erystals could be obtained in suffi- 
Clent quantity to collect. For the same reason the bisulphate 
sion of the mixed acids was treated with cold water. The fil- 
trate and washing on boiling deposited a light precipitate, which 
brought into solution and tested with tin gave an unmistakable 
reaction for titanium. Moreover, after separation of tantalum 
the columbie and titanic acids remaining in solution were ob- 
tained by evaporating with H,SO, and boiling with water and 
‘ CO : 
left but very little residue, which further examination proved 
to be mostly potassium titanate. eee 
n analysis No. 1, the two products containing titanic acid, 
obtained in this way, were fused with HKSO, which rendere 
the greater part soluble in cold water. This solution on boil- 
* Professor Smith remarks, ‘ I refer to the metallic acids in the analyses in this 
On oolumisa cata & the fact that 2 * it 
