970 M. Rose on Titanium. [Nov. 



analysis of the sulphuret of titanium was the only method which 

 afforded satisfactory results. 



Acidulous titanate of soda appeared to be composed of 



Exper. 1. Titanic acid 83*15 



Soda 16-85 



roo'oo 



Exper. 2. Titanic acid 83-14 



Soda 16-86 



100-00 



When this acidulous titanate of soda is treated with muriatic 

 acid, a part of the soda is taken from it, and a compound formed 

 which gave : 



Exper. 1, Titanic acid 96-20 



Soda 3-80 



100-00 



Exper. 2. Titanic acid 96-56 



Soda 3-44 



100-00 - 



The experiments performed upon the acidulous titanate of 

 potash did not correspond with the results obtained with acidu- 

 lous titanate of soda; this compound which had been heated to 

 redness was composed of 



Exper. 1. Titanic acid 81-99 



Potash 18-01 



100-00 



Exper. 2. Titanic acid 82-67 



Potash 17-33 



100-00 



Titanate of potash containing still more acid was composed of 



Titanic acid 91-30 



Potash 8-70 



100-00 



As these analyses did not lead to satisfactory results, M. Rose 

 tried the method of determining the point of saturation by the 

 quantity of carbonic acid, which the titanic acid was capable of 

 expelling from carbonate of potash at a red heat. 



In order to ascertain whether this method might be relied 



