PLATE 72 



Stimulating effect of the presoak method of treatment with formalin i to 400. (Repe- 

 tition of experiments shown in PI. 70, 71): 



1. Fulcaster wheat : A, C, seeds presoaked 6 hours, then formalin i to 400 for 6 

 hours, 84 per cent germination, plants stimulated; B, control, 87 per cent germination. 



2. Turkey wheat: A, C, seeds presoaked 6 hours, then formalin i to 400 for 6 hours, 

 64 per cent germination; B, control, 67 per cent germination. Note stimulation in 

 presoak -treated plants. 



3. Poole wheat: A, C, seeds presoaked 6 hoiu-s, then formalin i to 400 for 6 hours, 

 88 per cent germination; B, control, 94 per cent germination. Note increased vigor 

 and stimulation in presoak-treated plants. 



