PLATE 74 



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



1. Fife wheat: A, control, 79 per cent germination; B, seeds treated with formalin 

 I to 320 for 6 hours, 53 per cent germination; C, seeds presoaked 6 hours, then forma- 

 lin I to 320 for 6 hours, 82 per cent germination. 



2. Poole wheat: A, control, 88 per cent germination; B, seeds treated with forma- 

 lin I to 320 for 6 hours, 70 per cent germination; C, seeds presoaked 6 hours, then for- 

 malin I to 320 for 6 hours, 86 per cent germination. 



