l.— 1, No phosphate; 4, acid phosphate, 0.03 gram PaO s ; 7, acid phosphate, 0.06 gram PaOs; 10, acid 
phosphate, 0.12 grain PaOs; 13, rock phosphate, 0.24 gram P2O5; 16, no phosphate, silica gel, 50 
grams; 19, acid phosphate, 0.06 gram PaOs, silica gel, 50 grams; 22, rock phosphate, 0.24 gram PaOs, 
silica gel, 50 grams; 25, rock phosphate, 0.24 gram PaOs, silica gel, 150 grams 
I —3, No phosphate; 18, no phosphate, silica gel, 50 grams; 9, acid phosphate, 0.06 gram PaOs; 21, acid 
phosphate, 0.06 gram PaOs, silica gel, 50 grams; 15, rock phosphate, 0.24 gram PaOs; 24, rock phos 
phate, 0.24 gram PaOs, silica gel, 50 grams 
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