1922] EVANS—GERMINATION 223 
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pe ee t =< at peta re temperatures CC, of f seeds of Amaranthus 
Fic, 3. 
retroflexus collected at Gary, Indiana, in torts, ‘and treated with concentrated H, 
two minutes before being set to germinate. 
ERMIMATT. 
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Fic. 4.—Relative rate and total percentage germination at 42° C. of Amaranthus 
biichiaes stile collected at sioner , Washington, in 1915: (A) untreated before 
ing set to germinate; (B) trea od vith Ronen H,SO,; (C) ground with 
sand six weeks; (D) ground with cy nine weeks. 
