LIST OF ILLUSTRATIONS 



64 

 70 



98 



PLATE I. Pig. 1. Coke-oven Plant, Gary, Indiana, 

 where ammonium sulfate is an important 

 by-product opposite 32 



PLATE II. Fig. 2. Cylinder Experiments at the New 



Jersey Agricultural Experiment Station . " 



PLATE III. Phosphate Mining " 



Fig. 3. Phosphate Pit, Dunnellon, Florida. 

 Fig. 4. Mining Phosphate Rock by Means of 

 Floating Dredge. 



PLATE IV. Mining and Composting . . . . " 

 Fig. 5. Mining Phosphate Rock by Hydraulic 

 Pressure. 



FIG. 6. The Manure Spreader is a Labor-saving Device 



which secures an Even Distribution .... 126 



PLATE IV. Mining and Composting .... opposite 98 

 Fig. 7. Unloading and Composting New York 

 Stable Manure in South Jersey. 



PLATE V. Fertilizers and Wheat .... " 120 

 Figs. 8 and 9. Continuous Wheat Cropping with 

 and without Green-manures, New Jersey 

 Experiment Station. 



PLATE VI. Wheat and Potatoes .... " 140 

 Fig. 10. Wheat Grown as a Winter Cover- 

 crop Preceding Potatoes, Freehold, New 

 Jersey. 



PLATE VII. Fertilizers and Rye .... " 168 

 Figs. 11 and 12. Rye with One-half Ton of 

 Lime and without Lime, 

 xiii 



