Water Used ly Plants 29 



table showing the times of watering and the amounts of water 

 given through the whole growing season for the crop : 



Table showing the times of watering potatoes, and the amounts of 



water given 

 > In field < Cylinders above ground 



The potatoes in the two field cylinders matured first, and were 

 dug on Aug. 25, while the others stood until Sept. 21. It should 

 be stated in this connection that all of the potatoes, including 

 those in the field, were affected by the hot weather blight, so that 

 in no case were the plants in full vigor and presenting the normal 

 amount of foliage to the atmosphere. 



The yields 'of tubers in the several cases, and the computed 

 yields per acre, figured as proportional to the surface and vol- 



