236 BOTANICAL GAZETTE [NOVEMBER 
apparent injury was given by WALLDEN (56), who thought injuries 
to the coleoptile, making it difficult to pierce the soil, do not prevent 
the germination of seeds in blotters. Miss Hurp (33), after making 
a similar observation, expresses preference for the blotter studies, 
which she believes:show more clearly the distortion incident to 
MIN. 0 60 120 
TIME 
1.—Effect of time of soaking wheat on Aaesgr germination, Hybrid 12 
i pst Moro, Oregon: solid line shows percentage germination in blotters, sec 
lines in soil indoors and outside; formaldehyde mixed 1-320 parts of water; summary 
of 3600 seeds tested. 
injury, even though the percentage stand which would be attained 
under field conditions by this method could only be estimated. 
In varying the concentrations of formaldehyde, treatment was 
for ten minutes at 20° C., and the concentrations were varied from 
40 to 320 parts of water to 1 part of formaldehyde. Uniform 
dropping in germination occurred in all cases with increasing con- 
centrations. As compared with the water dipped controls, there 
was little injury apparent at the usual concentration of 1-320; 
but with a concentration of 1-160 the germination curves began to 
