PLATE LIV 
Fig. i.—Wheat on automatic balances in the screened inclosure, July 3, 1912, 
showing the exposure and arrangement of the 1912 experiments. 
Fig. 2.—Automatic balances A, B, and C; A and C carry pots of cowpea and B car¬ 
ries the evaporation tank. This shows the exposure of the plants in the 1913 and 
1914 transpiration experiments. 
