1 DISEASES OF THE SWEET PEA 



le other end of the tiles or pipes fits into 

 :ross-pipe which is connected with the 

 in steam pipe in the boiler. The steam 

 aow turned on and as fast as it escapes 

 im the holes it penetrates and heats the 



I in the bench or bed. The steam is 

 ned on from one to two hours according 

 the constancy and strength of the pres- 

 e. A good method of determining when 

 turn off the steam is to bury a few raw 

 tatoes at the surface of the bed and cover 

 ;m with some straw or sacking. When 

 ' potatoes are cooked the sterilization 

 3 been completed. This method of ster- 

 zation has the advantage of killing the 



worm and all the other soil troubles as 



II as the weeds. As above described, it 

 iomewhat expensive in the initial cost of 

 itallation. But once put in, it serves a 

 mber of years, and the pipings too may 



