24 Mr. J. Brown on the Products of the Soda Manufacture. 



Ball soda. BaO, CO2. COj. CO2 per cent. 



4.5-35 gave 28-90 6*487 14-304 



90-18 ... 59-20 13-289 14-736 



Average 14*620 



11. Carbon. — To determine the amount of carbon, a por- 

 tion of the ball was treated with muriatic acid and the solution 

 evaporated to dryness ; dilute acid was then added, and the 

 insoluble matter thrown on a filter which had been previously 

 dried at 212^ and weighed. The total amount of carbon, 

 silica and sand, was thus ascertained. The whole was then 

 ignited and weighed, and from the loss the per-centage of car- 

 bon was calculated. 



Ball soda. Insoluble matter. Carbon per cent. 



100 gave 15-941, which lost on ignition 7"998 



12. Water. — The soda ball was dried at 212°, and the 

 amount lost estimated. 



Ball soda. Water. Water per cent. 



50-00 lost . . 0-35 0-700 



Whilst washing out the soluble salts, it was observed that 

 the filtered solution was of a greenish colour; and upon boil- 

 ing it a green-coloured substance was deposited, after which 

 the supernatant liquor became perfectly colourless. Upon 

 examining this precipitate, it was found to consist principally 

 of silica and alumina with a little lime. From this it was 

 concluded to be artificial ultramarine, which is frequently 

 found in the crevices of the ball furnaces, and which, when 

 dissolved in caustic soda, yields a green-coloured solution, 

 precisely the same as that mentioned above. 



Ball soda. Ultramarine. Ultramarine per cent. 



200 gave . . 0-46 0-23 



100 ... 0-36 0-36 



Average 0*295 



Sulphate of soda . . . 1-160 



Chloride of sodium . . 1913 



Soda 24-138 



Lime 30-325 



Sulphur 12-536 



Carbonic acid .... 14 520 



Sand 4-285 



Silica 3*394 



Magnesia 0*350 



Alumina 0*846 



Iron 3-129 



Water 0*700 



Carbon 7*998 



Ultramarine .... 0*295 



