22 
Dr. Wollaston on metallic titanium. 
larger quantity of the slag which formed the subject of my 
first experiments, and has enabled me to determine the spe- 
cific gravity of metallic titanium to be 5.3. For this purpose, 
the vitreous part was fused with a mixture of borax and sub- 
carbonate of soda in about equal quantities, and was then dis- 
solved in muriatic acid, which also removed a quantity of 
metallic iron, and left the titanium freed from extraneous 
matter. Though great part of what was thus obtained from 
the interior of the slag was in a pulverulent state, the quan- 
tity, which amounted to 32 grains, and displaced 6,04 of 
water, was sufficient to preclude any considerable error. 
I have moreover learned that metallic cubes, similar to 
those which I have above described and examined, were, more 
than 20 years since, observed in a slag at the Clyde iron- 
works in Scotland ; that a small quantity has also been met 
with at the Low Moor iron- works, near Bradford, in York- 
shire ; and at the Pidding iron- works, near Alfreton, in Derby- 
shire ; and that some good specimens have been obtained from 
Ponty-pool, in Monmouthshire ; but it does not appear that 
any one has ascertained, or even suspected, the real nature 
of this singular product. 
