PLATE I 



Fig. I. — General view of the plant inclosure used at Akron, Colo., showing the pipe 

 framework covered with a hail screen, with the board base surmounted by a single 

 width of cheesecloth to protect the plants against high winds. Photographed on July 

 15, 1912. 



Fig. 2. — General view inside the inclosure, showing the arrangement of pots and 

 general conditions of growth. G)m and sorghums are shown in the foreground, small 

 grain in the background. Photographed on July 3, 1912. 



Fig. 3. — General view of the inclosiu'e photographed shortly after the grain in some 

 of the pots had been harvested. Photographed on September 4, 1912. 



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