Apr. i-sept. IS. 1921 Illustrations xiii 



Page 



6. Graph showing effect of formalin and copper-sulphate presoak treatments of 



>^-bushel wheat seed lots 378 



7. Graph showing effect of formalin i to 320 treatments for various periods, with 



and without presoaking 385 



8. Graph showing effect of formalin i to 320 and i to 200 on germination of com, 



barley, and oats with and without presoaking 386 



g. Curve showing rate of absorption of water by dry wheat seeds 387 



Plates 



69. Relative injury to wheat-seed germination caused by short and long for- 



malin treatments 393 



70. Eft'ect of formalin i to 400 treatment for 6 hours, with and without 6-hour 



presoak. i. Fultz wheat. 2. Poole wheat 392 



71. Effect of formalin i to 400 treatment for 6 hotus, with and without 6-hour 



presoak. i. Fulcaster wheat. 2. Turkey wheat 392 



72. Stimulating effect of the presoak method of treatment with formalin i to 



« 400 392 



73. Effect of formalin i to 200 treatment for 6 hours, with and without 6-hour 



presoak 392 



74. Effect of formalin i to 320 treatment for 6 hours, with and without 6-hour 



presoak 392 



75. I. Fife wheat: A, B, control, 83 per cent germination; C, D, seeds treated 



with formalin i to 320 for 3 hours, 62 per cent germination; E, F, seeds 

 presoaked 6 hours, then formalin i to 320 for 6 hours, 90 per cent germi- 

 nation. 2. Poole wheat: A, B, control, 85 per cent germination; CD. 

 seeds treated with formalin i to 320 for 6 hours, 55 per cent germination; 

 E, F, seeds presoaked 6 hours, then formalin i to 320 for 6 hours, 88 per 

 cent germination. 3. Effect of soaking in water throughout presoak 

 period, compared with procedure of keeping moist 6 hours: A, B, Fife 

 wheat; Q, D, Poole wheat; A, C, seeds soaked in water 5 hours, then 

 treated with formalin i to 320 for 7 hours; B, D, seeds soaked in water 

 10 minutes, drained, and kept moist 6 hours, then treated with formalin 

 I to 320 for 6 hours 392 



76. Effect of formalin and copper sulphate on wheat and of copper sulphate 



on barley, with and without presoaking 393 



77. Effect of presoak method used with copper-sulphate treatment of wheat. . 393 



78. Effect of presoak method used with formalin i to 320 on wheat under field 



conditions 392 



79. Effect of presoak method used with fortnalin i to 400 on blackchaff bacteria 393 



80. Effect of presoak method used with formalin i to 400 on blackchaff bacteria 39a 



81. Effect of presoak method on barley and oats 393 



82. Effect of presoak method used on barley, oats, and com 393 



Daily Development of Kernels of Hannchen Barley jrom Flowering 

 TO Maturity at Aberdeen, Idaho 



Text Figures 



1. Graph showing length, lateral diameter, and dorsoventral diameter of barley 



kernels for the 25 days following flowering 395 



2. Graph showing percentage of moisture per kernel from date of flowering. . . 397 



3. Graph showing maximum and mean daily temperatures recorded at Aber- 



deen, Idaho, from July 8 to August 4, 1916 (broken line), and from 

 July 15 to August 10, 19 18 (solid line) 398 



