UNDERDRAINING. 



83 



In covering, put sods or the black surface soil Covering xiies. 

 next to the tiles. The reason for this is that the 

 surface soil is composed of vegetable matter and 

 will prevent the subsoil from getting in at the joints. 



If the drains are properly laid, the least per- 

 ceptible fall will be sufficient to carry off the water 

 without clogging. A correct diagram of all drains 

 should be made and kept for future reference. 



Diagram 

 Important. 



/^ 



EARLY SOY BEAXS. 



