478 



Journal of Agricultural Research 



\o\. VI. No. 13 



plants of the same kind grown in the open. The relative water requir- 

 ment, however, is probably affected little, if at all, by the shading due to 

 an inclosure of this kind, and it offers the only scientific method for 

 studying the relative transpiration of plants under the severe climatic 

 conditions experienced in this region. 



WEIGHING THE CANS 



Each can was placed on a small wooden platform, which was provided 



with a screw eye at either end and mounted on four iron castors. By 



means of an iron rod, hooked at one end and bent into a handhold at the 



other, the cans could be moved easily wherever desired (PI. LXX, fig. 2). 



The cans were pulled over a track made of pine flooring to a small scale 



house located 12 feet from the shelter and were weighed every 48 hours 



on platform scales that were sensitive to 50 gm. (Pi. LXX, fig. i). In 



this manner two men could easily weigh the 60 cans in less than i>^ 



hours. 



EXPERIMENTAL DATA 



CORN 



Four varieties of com were grown in 19 14 and three varieties in 191 5. 

 The results for the two years are shown in Tables III and IV. 



Table III. — Water requirement of Pride of Saline corn at Garden City, Kans., in 1914 



and 191 5 



