Water Used by Plants 



35 



feet of soil, and all were placed in the plant-house, arranged in 

 the manner shown in Fig. 3. 



In these trials, two sizes of cylinders have been used : one 18 

 inches in diameter and 51 inches deep, and the other 36 inches 



Fig. 3. Method of growing plants in plant-house to determine the 

 amount of water used. 



in diameter and the same depth. The large cylinders this year 

 have been filled with a black marsh soil, and the small ones with 

 a virgin soil of medium clay loam variety, taken from a second- 

 growth black oak grove. 



First, the results obtained from four of the large cylinders 

 sowed to oats Dec. 12, 1896, and harvested July 1, 1897, after a 

 period of 200 days. The oats were sown thick, and grew very 

 rank, lodging quite badly. 



The total dry matter and the total water used by the crop 

 of the four cylinders was as given below: 



