6 ILLUSTRATIONS. 



Page. 

 Fig. 9. Diagram showing the nitrification of ammonium sulphate in samples of 

 soil from different depths from plat 220, Truckee-Carson Experiment 

 Farm 17 



10. Diagram showing the nitrification of ammonium sulphate in samples of 



soil from different depths from plat 230, Truckee-Carson Experiment 

 Farm 17 



11. Diagram showing the nitrification of ammonium sulphate in samples of 



soil from different depths from plats 240 and 250, Truckee-Carson 

 Experiment Farm 18 



12. Diagram showing the nitrification of ammonium sulphate in samples of 



soil from different depths from plats 260 and 270, Truckee-Carson 

 Experiment Farm 19 



13. Diagram showing the nitrification of ammonium sulphate in samples of 



soil from different depths from plats 280 and 290, Truckee-Carson 

 Experiment Farm 20 



14. Diagram showing the relation between the quantity of alkali and the 



nitrificati(m in .samples of soil from plats 180, 190, 170, 150, 100, IGO, 

 110, and 120, Truckee-Carson Experiment Farm. Samples taken 

 from depths of to 6 inches 21 



15. Diagram showing the relation between the quantity of alkali and the 



nitrification in samples of soil from plats 180, 120, 170, 100, 190, 150, 

 160, and 110, Truckee-Carson Experiment Farm. Samples taken from 

 depths of 6 to 12 inches 22 



16. Diagram showing the relation between the quantity of alkali and the 



nitrification in samples of soil from plats 180, 190, 170, 100, 120, 160, 

 110, and 150, Truckee-Carson Experiment Farm. Samples taken 

 from depths of 12 to 18 inches 23 



17. Diagram showing the relation between the quantity of alkali and the 



nitrification in samples of soil from plats 180, 170, 190, 100, 110, 160, 

 150, and 120, Truckee-( 'arson Experiment Farm. Samples taken 

 from depths of 18 to 24 inches 23 



18. Diagram showing the effect of calcium sulphate upon the nitrification 



of ammonium sulphate in samples of soil from plat 300, Truckee-Carson 

 Experiment Farm, representing poor soil '"A;" plat 310, representing 

 poor soil " B ; " and plat 320, representing good soil 29 



19. Diagram showing the ammonification of peptone in 7 days in samples of 



soil from plat 350 (good soil) and from plats 330 and 340 (poor soil), 

 Truckee-Carson Experiment Farm 30 



20. Diagram showing the ammonification of peptone in 15 days in samples 



of soil from plat 350 (good soil) and from plats 330 and 340 (poor soil), 



Truckee-Carson Experiment P\irm 31 



211 



