1921] 
HARRINGTON—GERMINATION 343 
larkspur seeds with the different temperature conditions used in 
1912. The different alternations are arranged from left to right 
| TEVIPER ATURE «, 
° 
9 G 
WX . . ‘ oP 4 
AN) : Y AN Vj 
G 5 LN S 
oie x DS \ % \ 
90 
80 Y = 
Saen 
~~ 
DD 
Aa! 
\ “ 
i \ 
FES CEM. 
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2.) 
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raze 
la 
— 
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Fic. 1.—Germination of two lots of larkspur seeds 
in the order of increasing mean temperature in the blotters. The 
percentage of germination decreased regularly as the temperature 
