Germination. 25 
MINIMUM. OPTIMUM. MAXIMUM. 
Bean (Scarlet runner)...... 49° Bocas. 77°-88° P...... 99°-111° F. 
Barlev....... 4L ow. 77-88 owe 88 -99 
Buck weat 41 yeisay 93  sxncwa 115 
Clover (red) sscccsosssccvstsvess 88-99 _...... 99 -111 ...... 111 -122 
CuCttm DEP oc .ec. cca ceesccienoeses 60-65 a... 88-99... 111 -122 
PYAR venpesesccvasouetsesetaverexsess 41 ow... Ti 8S as 88 -99 
HM p csyeec sii ese even aver ees 32-41 o... 99-111... 111 -122 
Indian COrn...........ceeeeeeeeee 41-51 oo... PO MLEL casey, 111 -122 
Lucerne ( Alfalfa).. ---88-99 99-111 ...... 111 -122 
MelOtiscciccssccge esnacasss 60-65 —...... 88-99... 111 -122 
COTES ssioess cateedeseaavastanesecsiees 32-41 0 w.. 77-88 o.. 88 -99 
POA vigsscerincerens neesvapuresis avers 32-41 o. 77-88 ao... 88 -99 
Pumpkin... eee 51-60... 93-111 ...... 111 -122 
RYO resccsdesensndeeisesvensdaeseiaiesy 32-41 0 w. 77-88 ~~ ...... 88 -99 
Sunflower .........ceseeeseseeceeee 41-51... 88-99... 99 -111 
Whe ate cicccciccovscesecessedesssesve 32-41 oo. 77-88) o. 88 -108 
These temperatures refer to the soil or other medium 
with which the seeds are in contact, and not to the atmos- 
phere. 
When moisture is sufficient, the time from planting to 
sprouting decreases rapidly as we approach the optimum 
temperature. In an experiment, Indian corn sprouted in 
one-third of the time at 88° F. that it required to sprout 
at 61°. 
31. Free Oxygen is Essential to Germination. If 
we place in the bottom of each of two saucers* a layer of 
puddledt clay or loam, put 25 beans capable of germination 
on the soil in each saucer, then fill one saucer with moist 
sand, and the other with puddled clay or loam, pressing the 
*If flower-pot saucers are used they should first be well soaked in water, so 
that they will not extract water from the soil. 
f Soil is said to be puddled when wet and packed until it is in the consistency 
of putty. 
2 
