Fig. 9: 
10. 
Inu 
13. 
14. 
16. 
18. 
19: 
ILLUSTRATIONS. 
Diagram showing the nitrification of ammonium sulphate in samples of 
soil from different depths from plat 220, Truckee-Carson Experiment 
Diagram showing the nitrification of ammonium sulphate in samples of 
soil from different depths from plat 230, Truckee-Carson Experiment 
Diagram showing the nitrification of ammonium sulphate in samples of 
soil from different depths from plats 240 and 250, Truckee-Carson 
Experiment Marm: 3... 22222422 hae ee 
2. Diagram showing the nitrification of ammonium sulphate in samples of 
soil from different depths from plats 260 and 270, Truckee-Carson 
Experiment Parmt:2 22.22.52 22 3. .2c Soe ee ee 
Diagram showing the nitrification of ammonium sulphate in samples of 
soil from different depths from plats 280 and 290, Truckee-Carsen 
Experment Barm 0... 2522. 532.) 3 eo ee 
Diagram showing the relation between the quantity of alkali and the 
nitrification in samples of soil from plats 180, 190, 170, 150, 100, 160, 
110, and 120, Truckee-Carson Experiment Farm. Samples taken 
from depthsof 0 to 6 Inches:..<-2 552 so ae eee ae 
. 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'to12 inches. 2-2... 5-*55.2. eee ee 
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: 25.5 0 ee. eS ee ee 
. 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-Carson Experiment Farm. Samples taken 
from depths of 18 to 24 inches......--- SL ae ae ree 
Diagram showing the effect of calcium sulphate upon the nitrification 
of ammonium sulphate in samples of soil irom plat 300, Truckee-Carson 
Experiment Farm, representing poor soil ‘‘A;’’ plat 310, representing 
poor soil “‘B;’’ and plat 320, representing good_soil.--._._--2_.-2__- 
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), 
Truckée-Carson Experiment Farm = =: =* 23555-2229 eee 
. Diagram showing the ammonification of peptone in 14 days in samples 
of soil from plat 350 (good soil) and from plats 330 and 340 (poor soil), 
Truckee-Carson Experiment Farm _.<=:22 52925935 ee 
211 
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