212 



Journal of Agricultural Research 



Vol. X. No. s 



attitude which has characterized some of the past evaporation inves- 

 tigations. 



Of course, hydraulic and irrigation engineers need to know the loss of water by- 

 evaporation, but in nature this is so mixed up with seepage, leakage, and consumption 

 by animals and plants that our meteorological data are of comparatively little impor- 

 tance, (i, p. 255.) 



Sei'£r 



ARKANSAS 



h%mi 



' Wirerpnce--^-^y 



Fig. I. — Map showing layout of Irrigation Field Laboratory for season of 1916. 

 EQUIPMENT 



The apparatus necessary for the work, including all evaporation pans, 

 all measuring devices for evaporation, and all meteorological instruments, 

 were specially installed for the investigation. All evaporation pans and 

 tanks were numbered in the order of their installation. Since the num- 

 bering also groups tanks of similar style, it has been followed throughout 



