PLATE 73 



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



1. Fultz wheat: A, seeds treated with formalin i to 200 for 6 hours without presoak, 

 43 per cent germination; B, control, 86 per cent germination; C, seeds presoaked 6 

 hours, then formalin i to 200 for 6 hours, 70 per cent germination. 



2. Poole wheat: A, seeds treated with formalin i to 200 for 6 hours without presoak, 

 46 per cent germination; B, control, 81 per cent germination; C, seeds presoaked 6 

 hours, then formalin i to 200 for 6 hours, 71 per cent germination. Note stimulation 

 in presoak-treated plants. 



