XX Journal of Agricultural Research voi. 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. Curv'e showing the dry weight of wheat plants germinating in College 



loam. Greenville loam, and sand containing various salts 2)Z 



2,2,. Curve showing the effect of various combinations of salts in different 



concentrations on the amount of dry weight produced 7,Z 



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. Curs^e 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 ok Peronosporaceae Related to Phytoph- 



THORA INFESTANS 



Fig. I. 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 



