Jail. 7-Mar. 25, 1918 



Illustrations xiii 



Fig. 19. Graphs of the seasonal studies of water extract of soil 12, Arnold fine Page 

 sandy loam 3 54 



20. Graphs of the seasonal studies of the water extract of soil 14, Standish 



fine sandy loam 355 



21. Graphs of the growth of crops in height, season of 1916 357 



22. Graphs of the daily studies of the water extract of soils lA and iB, sea- 



son of 1916 359 



23. Graphs of the daily studies of the water extract of soils 8A and 8B, 



July, 1916 360 



24. Graphs of the daily studies of the water extract of soils 8A and SB, 



August, 1916 360 



The FreEzing-Point Method as an Index of Variations in the Soil Solution 

 Due to Season and Crop Growth 



Fig. I. Graphs of the depressions of the freezing point in soils i and 2, with 



and without crop 372 



2. Graphs of the depressions of the freezing point in soils 3 and 4, with 



and \\nthout crop 373 



3. Graphs of the depressions of the freezing point in soil 5, with and with- 



out crop 374 



4. Graphs of the depressions of the freezing point in soil 6, with and with- 



out crop 375 



5. Graphs of the depressions of the freezing point in soils 7 and 8, with and 



without crop 37° 



6. Graphs of the depressions of the freezing point in soils 9 and 10, with and 



without crop 377 



7. Graphs of the depressions of the freezing point in soils 11 and 12, with 



and without crop _ 37° 



8. Graphs of the depressions of the freezing point in soil 14, with and 



without crop 37° 



9. Graphs showing the results of successive extractions of soils 5 and 8 . . . 392 



Efficacy of Some Anthelmintics 



Fig. I. Apparatus, with control, for administering copper-sulphate solution to 



sheep 407 



Tobacco Wildfire 



Fig. I. Parenchyma cells from the margin of a lesion showing Bacterium taba- 



cum in the intercellular spaces and within the cells 454 



2. a, Flagellaof Bacterium tabacum stained by Morrey's method; b, Bad. 

 tabacum from bouillon stained with carbol-fuchsin, showing arrange- 

 ment of the elements 454 



Influence of Carbonates of Magnesium and Calcium on Bacteria of Certain 



Wisconsin Soils 



Fig. I. Diagram showing the influence of calcium carbonate and limestone 



on the number of bacteria in Colby silt loam 47^ 



2. Diagram showing the influence of calcium carbonate and monocal- 



cium phosphate on the number of bacteria in Colby silt loam 472 



3. Diagram showing the influence of calcium carbonate and limestone on 



the number of bacteria in Plainfield sand 473 



4. Diagram showing the influence of calcium carbonate and monocal- 



cium phosphate on the number of bacteria in Plainfield sand 474 



