MANURE. 165 



that the farmer may himself prepare it, and unless 

 he resides in the neighborhood of a soap-boiler, at a 

 cheaper rate than he can buy and cart home this 

 liquid manure. A hogshead of spent ley, of 100 

 gallons, contains, if from ashes, 



50 pounds of glycerine or geine, 

 53 " muriate of potash, 



13 " sulphate of potash. 



The salts may easily be supplied. It becomes a 

 highly interesting question, whether the glycerine 

 has any specific action, any action which the light of 

 chemistry may not kindle in similar substances. By 

 reference to (228) its chemical constitution, ap- 

 proaches geine, and they are here presented side by 

 side. 



Glycerine. Geine of Soil. 



Carbon, 40-07, 5800 



Hydrogen, 8-92, 2-10 



Oxygen, 5100, 39,90 



234. The glycerine resolves itself into water, 

 free carbon and carburetted hydrogen, or the gas of 

 marshes and stagnant pools. The geine into car- 

 bon and water. Tn the series of changes which 

 these may undergo, let it be supposed, that carbu- 

 retted hydrogen gas, is evolved by glycerine. There 



