Oct. i-Dec. 31, X917 
Illustrations 
XIII 
Page 
Fig. 14. Graphs showing the effect of temperature on apple-scald at the end of 
2, 3> 4, 5> 6, 7, 8, 9, 10, 15, and 17 weeks. 298 
15. Graphs showing the effect of temperature on apple-scald at the different 
* temperatures at the end of 4, 5, 6, 7, 9, 10, 13, and 15 weeks.... 298 
16. Graphs showing the effect of aeration and humidity on apple-scald... 299 
17. Graphs showing the amount of scald on Grimes apples from o° and 5 0 
C., 3 days after removal from storage. 301 
18. Graphs showing the development of color on Grimes apples in storage.. 302 
19. Graphs showing the development of color on Grimes apples in storage.. 302 
20. Graphs showing the development of color on Grimes apples in storage.. 303 
21. Graphs showing the influence of aeration and humidity upon the color 
development of Grimes apples in storage at 15 0 C.. 303 
22. Graphs showing the influence of aeration and humidity upon the color 
development of Grimes apples in storage at 15 0 C. 310 
23. Graphs showing the influence of aeration and humidity upon the color 
development of Grimes apples in storage at 15 0 C. 311 
Studies in Greenhouse Fumigation with Hydrocyanic Acid: Physio¬ 
logical Effects on the Plant 
Fig. 1. Curves showing in two samples of tomato leaves the effect on oxidase 
activity of the presence of hydrocyanic acid during the determina¬ 
tion.... 322 
2. Curves showing the oxidase activity of leaf powders treated with vary¬ 
ing concentrations of hydrocyanic-acid solution, the latter having 
been removed before the determination was made... 322 
3. Curves showing the hourly activity of the oxidases of fumigated and of 
normal tomato plants.... 323 
4. Curves showing the oxidase activity of fumigated and of unfumigated 
tomato plants over a period of eight weeks. 323 
5. Curves showing the effect of hydrocyanic-acid fumigation on the ac¬ 
tivity of the catalase in tomato. 324 
6. Curves showing the rate of respiration (in milligrams of carbon dioxid 
per hour per 1 gm. of dry matter in plant) of four pairs of tomato 
Plants. 325 
7. Growth curves of three sets of tomato plants as affected by hydrocyanic- 
acid fumigation. 329 
8. Curves showing the production of fruit by the three sets of tomato plants 
in figure 7. 330 
9. Growth curves of three sets of lettuce plants, showing the effect of light 
and severe fumigation with hydrocyanic acid. 331 
10. Transpiration curves of tomatoes as affected by hydrocyanic-acid 
fumigation. 334 
11. Curves showing the cuticular transpiration of fumigated and of nor¬ 
mal tomato plants. 335 
Effect of Pumping from a Shallow Well on the Ground-water Table 
Fig. i. Plan showing location of irrigation canals and test wells with reference 
to the pumping plant. 340 
2. Ground-water curves for 1914 and 1915 (wells i, 2, and 3). 341 
3. Ground-water curves for 1914 and 1915 (wells 4, 5, and 6). 343 
4. Ground-water curves for 1914 and 1915 (wells 7, 8, and 9). 344 
5. Ground-water curves for 1914 and 1915 (wells io, 11, and 12). 345 
