226 



After describing the first process of grinding the earth in 

 a mortar, Mr. Waldie goes on to say : 



" Each sample was subjected to a mechanical analysis, 

 t>y thoroughly softening the soil with boiling water, and 

 elutriating. This was done by subjecting the softened 

 earth, placed in a tall deep glass, to a current of water 

 through a pipe issuing from an orifice of about a sixteenth 

 of an inch in diameter near the bottom of the glass (the 

 column of water in the pipe being about fifteen inches 

 high), till all the finer portions were washed off, the residue 

 being coarse sand. The finer portions being allowed to 

 settle, were again subjected to a gentle current of water, 

 or rather a rapid dropping through the same tube till all 

 the finest particles were washed off. The residue was fine 

 sand. The finest particles settled were the clay. Each 

 portion was dried at 212, weighed, burnt, and weighed 

 again, and the following were the results : 



No. I. Black Soil from Puchlaora, Pergunnah Rajwara. 

 Loss by drying at 212, 6*8 per cent, moisture. 



