ILLUSTRATIONS. 



Page. 



IV. Fig. a. Second crop of plants, grown 5 clays in residual solu- 

 tions (1) distilled water; (2) distilled water + calcium car- 

 bonate; (3) sol. 7, potassium sulphate; (4) sol. 8, potassium 

 sulpha te+ calcium carbonate; (5) sol. 11, sulphuric acid; 

 (6) sol. 12, sulphuric acid + calcium carbonate. Fig. &. 

 Second crop of plants, grown 5 days in residual solutions 

 (1) distilled water; (2) sol. 3, so'dium nitrate; (3) sol. 7, 

 potassium sulphate; (4) sol. 13, sodium nitrate and potassium 



sulphate 12 



V. Fig. a. Crop grown 5 days in (1) distilled water; (2) distilled 

 water+aluminum hydrate; (3) potassium chlorid; (4) 

 potassium chlorid+aluminum hydrate ; (5) hydrochloric acid; 

 (6) hydrochloric acid+aluminum hydrate. Fig. 6. Crop 

 grown 5 days in (1) distilled water; (2) distilled water-f 

 aluminum hydrate; (3) potassium sulphate; (4) potassium 

 sulphate +aluminum hydrate; (5) sulphuric acid 16 



VI. Fig. a. Crop grown 5 days in (1) distilled water; (2) distilled 

 water+aluminum hydrate; (3) sodium nitrate; (4) sodium 

 nitrate + aluminum hydrate; (5) sodium hydrate; (6) sodium 

 hydrate+aluminum hydrate. Fig. &. Crop grown 5 days in 

 (1) distilled water; (2) sodium nitrate; (3) potassium 



chlorid; (4) potassium sulphate; (5) potassium nitrate 16 



VII. Fig. a. Crop grown 5 days in (1) distilled water; (2) distilled 

 water + ferric hydrate; (3) potassium chlorid; (4) potassium 

 chlorid + ferric hydrate; (5) hydrochloric acid; (6) hydro- 

 chloric acid+ferric hydrate. Fig. 6. Crop grown 5 days in 

 (1) distilled water ; (2) distilled water + ferric hydrate; (3) 

 potassium sulphate; (4) potassium sulphate+ferric hydrate; 



(5) sulphuric acid; (6) sulphuric acid+ferric hydrate 16 



VEIL Fig. a. Comparison of entire pan of wheat plants grown in 

 (1) distilled water; (2) potassium sulphate; and (3) potas- 

 sium sulphate + calcium carbonate. Fig. 6. Clover plants 

 grown with wheat in (1) distilled water; (2) distilled water-f- 

 calcium carbonate; (3) potassium sulphate; (4) potassium 

 sulphate+calcium carbonate 16 



