Heinrich Rose. 311 
The research upon titanium was also begun in the laboratory 
of Berzelius, and was taken, as has been said, for the subject of 
his inaugural dissertation. 
Stass, give for the equivalent of titanium the number 24-12— 
Tom the titanic acid, combined respectively with the chlorid of 
numbers 24-90 and 23°47, of which that assumed by Rose is 
very nearly the mean. : 
Rose’s extreme values, according to his own mode of calcu- 
lation, are 24-03 and 24-25. 
le lower atomic weight given by some of them is ascribed by 
him to the fact that ey wake made with a chlorid which had 
