Oct. 1, 1919-Mar. IS, 1920 Illustrations XI 



Page 

 Plate 37. Photographs enlarged from portions of a motion photomicrograph, 

 showing the method of cell wall penetration by Pythium hyphae. A. — 

 vShows the hypha growing against the potato cell wall. B. — A little later 

 stage than A. C. — The tip has bx-oken through as a small tube. D. — Pen- 

 etration is complete 298 



Effect of Lime upon the Sodit m-Chlomd Tolerance of Wheat 



Seedu.vcs 



Plate 38. A. — Seedlings grown in (i) distilled water, (2) 500 parts per nullion 

 sodium-chlorid solution, (3) 1,000 parts per million sodium-chlorid solu- 

 tion, (4) 2,000 parts per million sodium-chlorid solution, (5) 3,000 parts 

 per million sodium-chlorid solution, and (6) 4,000 parts per million sodium- 

 chlorid solution. B.— Seedlings grov\-n in sand and vvacered with (i) dis- 

 tilled water, (2) 500 parts per million sodium-chlorid solution, (3) 1,000 

 parts per million sodium-chlorid solution, (4) 2,000 parts per million 

 sodium-chlorid solution, (5) 3,000 parts per millioa sodium-chlorid solu- 

 tion, and (6) 4,000 parts per million sodium-chlorid solution 356 



Plate 39. Seedlings grown in water, sand, and clay, showing ellects of (i) dis- 

 tilled water, (2) 500 parts per million sodium-chlorid solution, (3) 1,000 

 parts per million sodium-chlorid solution, (4) 1.500 parts per million 

 sodium-chlorid solution, (5) 2,000 parts per million sodium-chlorid solution, 

 (6) 3,000 parts per million sodium-chlorid solution, and (7) 4,000 parts per 

 million sodium-chlorid solution 356 



Plate 40- A.— Seedling, 9 days old, grown in clay watered with (i) distilled 

 water, (2) 500 parts pei million sodium-chlorid solution, (3) i.oco parts per 

 million sodium-chlorid solution, (4) 1,500 parts per million sodium-chlorid 

 solution, (5) 2,000 parts per million sodium-chlorid solution, (6) 3,000 

 parts per million sodium-chlorid solution, and (7) 4,000 parts per million 

 sodium-chlorid solution. B. Seedlings, 3 days old, removed from 

 (i) 4,000 i^arts per million sodium-chlorid solution, (2) sand watered with 

 4,000 parts per million sodium-chlorid solution, and (3) clay watered with 

 4,000 parts per million sodium-chlorid solution ^i:6 



Plate 41- A.— Seedlings grown in sand and in the following solutions filtered 

 through sand: (i) distilled water, (2) 1,000 parts per million of sodium 

 chlorid, (3) 1,500 parts per million of sodium chlorid, (4) 2,000 parts per 

 million of sodium chlorid, (5) 3,000 parts per million of sodium chlorid, 

 and (6) 4,000 parts per million of sodium chloxid. B. — Seedlings grown in 

 clay and in the following solutions filtered through clay: (i) distilled 

 water, (2) 1,000 parts per million of sodium chlorid, (3) 1,500 parts per mil- 

 lion of sodium chlorid, (4) 2,000 parts per million of sodium chlorid, 

 (5) 3,000 parts per million of sodium chlorid, and (6) 4,000 parts per million 

 of sodium chlorid 756 



Plate 42. A. — Seedlings, 10 days old, removed from sand watered with (i) 

 distilled water, (2) 1,000 parts per million sodium-chlorid solution, (3) 

 1,500 parts per million sodium-chlorid solution, (4) 2,000 parts per million 

 sodium-chlorid solution, (5) 3,000 parts per million sodium-chlorid solu- 

 tion, and (6) 4,000 parts per million sodium-chlorid solution. B. — Seed- 

 ings, 10 days old, removed from clay watered with (i) distilled water, (2) 

 1,000 parts per million sodium-chlorid solution, (3) 1,500 parts per million 

 sodium-chlorid solution, (4) 2,000 parts per million sodium-chlorid solution, 

 (s) 3,000 parts per million sodium-chlorid solution, and (6) 4,000 parts per 

 million sodium-chlorid solution 356 



