BULLETIN OF THE BUSSEY INSTITUTION. 19 
II. For the trial with carbonate of potash, 1.727 grammes of this 
salt were dissolved in water to 250 c. c., and there was found in the 
filtrate, after twenty-four hours’ digestion with the ashes, — 
0.0090 gramme of lime, 
0.0058 “ magnesia, 
11195, “  *«* potash, 
besides an amount of soda and lithia equivalent to 0.0413 gramme 
of the mixed chlorides of these substances. Since the original solu- 
tion of carbonate of potash contained 1.1773 grammes of potash, 
the amount of that substance absorbed by the ashes was 0.0578 
gramme. 
III. For the trial with-chloride of potassium, 0.932 gramme of this 
salt was dissolved in water to 250 c.c. There was found in the fil- 
trate, after twenty-four hours’ digestion with the ashes, — 
0.0970 gramme of lime, 
0.0243 “ magnesia, 
0.5998 ‘“  * potash, 
besides an amount of soda and lithia equivalent to 0.0423 gramme 
of their mixed chlorides. Since the original solution of chloride of 
potassium contained only the equivalent ‘of 0.5888 gramme of potash, 
it would appear that, instead of absorbing any of the potassium of 
the salt, the coal-ashes gave up 0.011 gramme of it to the solution. 
Further experiments are needed upon this point. 
IV. A partial trial was made with sulphate of ammonia also, 1.4 
grammes of the salt being dissolved in water to 250 c. c., and digested 
with 100 grammes of ashes, as before. There was found in the 
filtrate 
0.1240 gramme of lime, 
0.1680 « “ magnesia and alkaline chlorides. 
The amount of lime dissolved by the saline solutions from the ashes, 
as compared with the quantity dissolved by pure water, is decidedly 
large in every instance, with the exception, naturally, of the solution - 
of carbonate of potash. 
