Mr. W. Crowder on the Fatty Acid of Cocculus indicus. 25 



II. 4-935 grains of soda salt, treated as before, gave 1-135 

 sulphate of soda = 10-03 percent, of soda. 5-35 grains of soda 

 salt gave, on ignition, 0*92 of carbonate of soda = lO'OS per 

 cent, of soda. — Mean 10-04. 



Mean of four determinations. 



Calculation. 



Experiment. 



Carbon 



Hydi-ogen 



Oxygen 



Soda 10-15 



10000 306 



No. I. was prepared by adding an alcoholic solution of caustic 

 soda to an alcoholic solution of the acid. The salt separates on 

 cooling, and is to be purified by re-solution in rectified spirit. 



No. II. was prepared in the same manner as the potash salt, 

 substituting carbonate of soda for carbonate of potash. 



So far as the (determination of soda in this substance is con- 

 cerned, it may be inferred that the formula given is correct ; but 

 as the combustion required the use of chlorate of potash, I did 

 not deem it necessary to incur the trouble of performing that 

 operation. 



Bassiate of Ammonia. — This salt may be prepared by dissol- 

 ving the acid in a hot dilute solution of caustic ammonia and 

 allowing it to cool, when it crystallizes in innumerable small 

 needles. A clear solution of this salt, if kept hot for any length 

 of time, becomes opalescent from decomposition ; and even the 

 addition of a fresh quantity of ammonia does not cause the pre- 

 cipitate, once formed, to redissolve entirely. It is soluble in 

 alcohol and in aether, and is very prone to decomposition from 

 loss of ammonia. 



Bassiate of Baryta. — This salt Avas prepared and purified with 

 very great ease by dissolving the acid in a small excess of caustic 

 ammonia, and whilst still quite hot, adding a solution of chloride 

 of barium. A white curdy precipitate is formed, which is to be 

 filtered and washed witli boiling water till free from chloride of 

 barium, and dried at 212'^. It is a white powder, without any 

 apparent crystalline structure, insoluble in water, alcohol, and 

 aether of high specific gravity. 



Analysis gave the following results : — 



I. 6-460 grains of baryta salt gave, on ignition, 1*810 of car- 

 bonate of baryta = 21 '74 per cent, baryta. 



II. 5-820 grains' of baryta salt gave, on ignition, 1-635 of 

 carbonate of baryta = 21-82 per cent. 



5-865 grains of baryta salt gave 13*270 of carbonic acid and 

 5*445 of water. 



