PLATE 69 



Relative injury to wheat-seed germination caused by short and long formalin treat- 

 ments: 



A. — Effect of formalin i to 400 and i to 200 treatment for 3, 6, and 12 hours on China 

 variety : 



Row I, formalin i to 400 for 3 hours, 56 per cent germination; 



Row 2, formalin i to 400 for 6 hours, 53 per cent germination; 



Row 3, formalin i to 400 for 12 hours, 74 per cent germination; 



Row 4, control, 78 per cent germination; 



Row 5, formalin i to 200 for 3 hours, 39 per cent germination; 



Row 6, formalin i to 200 for 6 hours, 37 per cent germination; 



Row 7, formalin i to 200 for 12 hours, 57 per cent germination. 

 B . — Effect of formalin i to 400 and i to 200 treatment for 3,6, and 1 2 hours on Turkey 

 variety : 



Row I, formalin t to 400 for 3 hours, 42 per cent germination; 



Row 2, formalin i to 400 for 6 hours, 48 per cer.t germination; 



Row 3, formalin i to 400 for 12 hours, 50 per cent germination; 



Row 4, control, 56 per cent germination ; 



Row 5, formalin i to 200 for 3 hours, 23 per cent germination; 



Row 6, formalin i to 200 for 6 hours, 17 per cent germination; 



Row 7, formalin i to 200 for 12 hours, 34 per cent germination. 

 Note increased vigor and germination of 12-hour treated seeds compared with 3-hotir 

 or 6-hour treated seeds. 



