CAMPBELL'S SOIL CULTURE MANUAL 



65 



ment of the moisture the plant is amply supplied, under 

 which conditions the damage so common is not only 

 prevented, but the plant has been able to make a rapid, 

 healthy growth right through, while plants in ordinary 

 manner have suffered and possibly been ruined because 

 of shortage of moisture. 



When we reach a point in the extreme heated portion 

 of the last afternoon prior to a heavy rain, where our 

 supply of moisture is beginning to shorten, the fact that 

 we have by this sub-surface packing been able to lift the 

 water stored below a little faster may be the means of 

 doubling or trebling the yield. 



Another point that has been but slightly touched upon 

 is, that by this fine, firm substratum we are able to carry 

 what might be quite properly termed a balanced quantity 

 or ration of both air and water, thus bringing about that 

 most ideal condition for the development of fertility. 



DEVELOPMENT OF ROOTS. 



Cut No. 6. Development of Roots in Firm Soil. 

 In cut No. 6, we represent the cross section of a lat- 



