260 BOTANICAL GAZETTE. 
P. M., as a check upon the accuracy of our apparatus, which was 
designed to keep at a constant temperature with a variation of but 
two degrees. Our success with the lowest temperatures was ed 
fect. The higher temperatures were with trial apparatus, an 
had a wider range until experience led to perfecting. iy 
The following table gives the hour at which first germination 
was observed at the various temperatures, the seed from the same 
ear for each variety : 
Iu. | Exp. 1. | Exp.1. 
wer | ames | 49° 50°. | 55°56 
Dent Corn. 
~ Adams’ Early rt nak ris. 180 142 
~ Chester Co. Mammoth.......... | 233 OS eee 168 142 
Flint Corn, 
_Waushakum 331 Ce ee 228 142 
_Eight-rowed White............. eS aeke: (ed 216 150 
Soft Corn. 
Tuscarora vey. 408 228 161 
“Zani Blue yee ee ae 228 185 
Pop Corn. 
. White Pearl 378 OS eee 228 142 
“Amber Rice S78 Vo 228 142 
Dwarf Gold 498' 15k pb OAs, 228 142 
Corn, 
“_Stowell’s Evergreen ...........+4| 462 bcs 504 228 195 
Narragansett 1. 6 So aie 300 | 209 
I STTAG ANSE renee nreeseeeessseee] 498 | 300_| 
cate in 222 hours in Experiment I; and in Experiment IV the 
same seed germinated in one trial in 498 hours and its duplicate 
in 523 hours. Dwarf Golden pop, in Experiment IV, germina- 
ted in 498 hours in one trial and 738 hours in its duplicate. 
hours, the average germination after this interval being as below, 
ony the ungerminated seeds in all cases sound at the conclusion of 
the trial, 
