On the apparent magnetism of metallic Titanium. 401 
By a similar mode of trial, I found that cobalt carried from 
fifty to sixty times its weight, and that a similar quantity of 
nickel supported from twenty to thirty times its own weight 
by the same magnet. 
From the above comparison of the magnetic forces, it is 
evident that the presence of about part of iron as an 
alloy in the metallic Titanium, would be sufficient to account 
for this power, without regarding Titanium itself as a mag- 
netic metal ; and its origin in the midst of iron, gives every 
reason to suspect that it would be contaminated by some 
proportion of that metal. 
It is, however, extremely difficult really to detect the pre- 
sence of so small a proportion of iron, on account of the high 
colour of the precipitates of Titanium. For though it may be 
easy to produce an appearance of blue by using a prussiate, 
which already contains iron, and is consequently better 
adapted to prove the absence of iron where no blueness ap- 
pears, than to ascertain its presence, it is by no means easy 
to obtain the more indisputable evidence of iron by infusion 
of galls. It is only by repeated evaporation of the muriatic 
solution, and continued exposure of the residuum to the tem- 
perature of boiling water, that I have succeeded in separating 
enough of the Titanium to allow the blackness of gallate of 
iron to appear, when the efflorescent edges of the dried salt 
are touched with infusion of galls. 
Although the quantity thus rendered sensible does not ap- 
pear in proportion sufficient to account for the magnetic force 
observed, there seems more reason to ascribe it to this im- 
purity, than to suppose Titanium possessed of that peculiar 
property in a degree so far inferior to the other known mag- 
netic metals. 
3 F 
MDCCCXXIII. 
