TEXT FIGURES 



Behavior of vSweet Potatoes in the Ground 



Fig. I. Graphs showing changes in composition of Big Stem sweet potatoes page 

 during the latter part of the season, from September 18 to November 

 27, and the minimum temperatures at the United States Weather 

 Bureau Observatory at Washington, D. C, some 20 miles distant, 

 during that period 16 



GossYPOL, the Toxic Substance in Cottonseed 



Fig. I . Graphs of the growth of pigs qi 



2 . Graphs of the gains per week of pigs gi 



3 . Graphs of the growth of pigs 94 



Irrigation Experiments on Apple-Spot Diseases 



Fig. I. Diagram showing the soil-moistvtre conditions in irrigated plats of Gano 



apples 113 



2. Diagram showing the soil-moisture conditions in irrigated plats of 



Grimes apples 114 



3. Diagram showing the amount of bitter-pit on Grimes apples 116 



4. Diagram showing soil-moisture conditions in irrigated plats of Grimes 



apples 117 



5. Diagram showing the amount of bitter-pit on Grimes apples 118 



6. Diagram showing the relation of the amount of bitter-pit to the size of 



apples 119 



7. Diagram showing the soil-moisture conditions in irrigated plots of Jon- 



athan apples in 1915 121 



8. Diagram showing the amount of bitter-pit on Jonathan apples in 1915. . 123 



9. Diagram showing the soil-moistiu-e conditions on plots of Jonathan 



apples in 1916 124 



10. Diagram showing the amount of bitter-pit on Jonathan apples inigib. 125 



A Study of the Plow Bottom and Its Action upon the Furrow Slice 



Fig. I. Diagram giving the generatrices, directrices, and equations of surfaces 



of historical plow bottoms 150 



2-10. Graphs of the development of plow bottoms 152, 155, 157, 159, 160 



11-14. Graphs of the motion of soil particles in plowing 163, 164, 166 



15. JeflFerson's plow bottom 173 



16. Lambruschini 's plow bottom 175 



17-18. Small's plow bottom 175, 176 



19-2 1 . Stephen 's plow bottom 177 



22-25. Rahm's plow bottom 178, 179 



26. Knox's plow bottom 179 



Relation of the Variability of Yields of Fruit Trees to the Accuracy of 



Field Trials 



Fig. I. Diagram showing the individual tree yield of the navel-orange grove . 252 

 2. Diagram showing the individual tree yield of the navel-orange grove 



(Antelope Heights) 254 



(XI) 



