466 



Messrs. A. D. Hall and C. G. T. Morison. [Dec. 22, 



almost identical with it. In other words, the free supply of silica without 

 phosphoric acid to Plot 1 S has enabled the plant to mature as high a 

 proportion of grain, and almost as rapidly, as does the supply of phosphoric 

 acid to Plot 2. The further addition of silica to phosphoric acid as on 

 Plot 2 S does not effect any change in the character of the development of 

 the grain. 



July 4 n 18 25 Aug.l 8 



Fig. 5. — Percentage of Grain in Plant. Plots without Potash. 



July 4 n 18 25 Aug. i 8 



Fig. 6.— Dry Grain in 100 Total Dry. Plots with Potash. 



