ILLUSTRATIONS. 
Page. 
Platb I. Fig. 1. — Comparative availability of phosphoric acid in three types 
of soil; only nitrogen and potash added. Fig. 2. — Influence of 
sodium phosphate, Experiment I, Millet 1 12 
II. Fig. 1. — Comparative influence of phosphates, Experiment I, Millet 
I. Fig. 2. — Comparative influence of phosphates, Experiment I, 
Millet 1 12 
III. Fig. 1. — Comparative influence of phosphates, Experiment II, Mil- 
let I. Fig. 2. — Comparative influence of phosphates, Experiment 
II, Millet 1 16 
IT. Fig. 1. — Comparative influence of phosphates, Experiment II, Mil- 
let I. Fig. 2. — Influence of cowpeas on the availability of phos- 
phate rock, Experiment II, Millet 1 16 
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