XX 
Journal of Agricultural Research 
Vol. V 
Page 
Fig. 29. Curve showing the effect of concentration of salts on the number of 
seeds of various kinds germinating. 31 
30. Curve showing the effect of sodium chlorid, sodium carbonate, and 
sodium sulphate on the number of plants up from seeds of various 
kinds. 32 
31. Curve showing the dry weight of wheat plants germinating in College 
loam, Greenville loam, and sand with different concentrations. 32 
32. Curve showing the dry weight of wheat plants germinating in College 
loam, Greenville loam, and sand containing various salts. 33 
33. Curve showing the effect of various combinations of salts in different 
concentrations on the amount of dry weight produced. 33 
34. Curve showing the effect of concentration of salts on the dry weight of 
plants from seeds of various kinds... 34 
35. Curve showing the effect of soduim chlorid, sodium carbonate, and 
sodium sulphate on the dry weight from seeds of various kinds. 35 
36. Curve showing the number of days for wheat plants to come up in Col¬ 
lege loam, Greenville loam, and sand with different concentrations.. 36 
37. Curve showing the number of days for wheat plants to come up in Col¬ 
lege loam, Greenville loam, and sand containing various salts. 37 
38. Curve showing the effect of various combinations of salts in different 
concentrations on the number of days to come up. 38 
39. Curve showing the effect of concentration of salts on the number of days 
to come up from seeds of various kinds.. 38 
40. Curve showing the effect of sodium chlorid, sodium carbonate, and 
sodium sulphate on the number of days to come up from seeds of 
various kinds. 39 
41. Curve showing the height of wheat plants germinating in College loam, 
Greenville loam, and sand with different concentrations. 39 
42. Curve showing the height of wheat plants germinating in College loam, 
Greenville loam, and sand containing various salts.. 40 
43. Curve showing the effect of various combinations of salts in different 
concentrations on the height of plants. 40 
44. Curve showing the effect of concentration of salts on the height of plants 
from seeds of various kinds. 41 
45. Curve showing the effect of sodium chlorid, sodium carbonate, and 
sodium sulphate on the height of plants from seeds of various kinds.. 41 
46. Diagram showing the percentage of alkali salt in loam soil giving about* 
half normal germination and production of dry matter in wheat.... 49 
47. Diagram showing the percentage of alkali salt in coarse sand giving 
about half normal germination and production of dry matter in wheat 50 
48. Curve showing the percentage of sodium chlorid, sodium carbonate, 
and sodium sulphate in Greenville loam giving about half normal 
germination and production of dry matter. 51 
Perennial Mycelium in Species op Peronosporaceae Related to Phytoph- 
THORA INFESTANS 
Fig. 1. A cross section of a stem of Helianthus divaricatus which is infected with 
Plasmopara halstedii . 65 
Hibernation of Phytophthora infestans in the Irish Potato 
Fig. i. Cross section of a potato plant, showing the mycelium of Phytophthora 
infestans , which has killed the cells of the cortex and is a later stage 
than that shown in figure 3. 89 
