AGRICULTURE WITH CHEMISTRY. 



necessary to enter into a description of them, in a Trea- 

 tise which has principally in view such circumstances and 

 matters as have not hitherto, on chemical principles, 

 received satisfactory explanation. Under-draining at this 

 time is very deservedly in great estimation, and is becom- 

 ing the general practice. It saves much waste of ground, 

 more completely answers the intended purpose, is of 

 longer duration, and ultimately less expensive than any 

 other kind of draining. A method has lately been disco- 

 vered, and pratlised with success, by which, in many places> 

 the upper stratum is drained by the assistance of the mi- 

 neral strata beneath it, through which the water is made to 

 drop, and in this manner taken from the surface. Drain- 

 ing is not only to be accomplished by these judicious 

 methods, and by open drains, but lands are to be made 

 dry by such a mechanical alteration in the component 

 parts of the soil as render it less retentive of moisture. 

 In stiff lands this may be effected by lime, chalk, marl, 

 coal-ashes, brick-dust, or calcined clay, and by sand, 

 when applied in large quantities, whilst the too great 

 tendency in sandy or light soils to part with moisture is 

 to be corrected by other applications. 



FAL- 



