No. 33.] 121 
Average Extreme Variation 
temp. temperatures. of temp. 
‘ Deg. Deg. Deg. 
4th 24 hours........ 49.4 47.1-50.7 3.6 
Sth 24 hours........ 48.6 48.3-49.1 0.8 
6th 24 hours....... 48.2 46 .0-50.0 4.0 Dents germinated. 
With 24 hours........ 47.4 46.0-48. 5 2.5 
8th 24 hours........ 46.9 46.0-47.6 1.6 
9th 24 hours........ 47,7 46.0-49.4 3.4 Flints, Softs and Pops 
10th 24 hours....... 47.7 46.5-50.0 3.5 germinated. 
1ith 24 hours........ 47.5 46.4-48.9 2.5 
12th 24 hours........ 48.1 47.3-49.4 2.1 Sweets germinated. 
13th 24 hours........ 48.7 47.4-50.7 3.3 
14th 24 hours ....... 46.5 44,7-49.1 4.4 
15th 24 hours........ 47.3 45.3-49.2 3.9 
16th 24 hours ....... 47.7 46.0-50.0 4.0 
17th 24 hours....... 49.1 47,8-50.0 2.2 
The first germination noted was on the 168th hour, the average 
temperature being 48.2 deg., the extremes 45.8 deg., and 50.7 deg., 
and the variety the Chester Connty Mammoth Dent, the same that 
2a ae among, if not the first, in the preceding trial. In the 
rst trial the average temperature was 52.2 deg., and the time 141 
hours, or expressing in tabular form : 
Germinated. Av. temp. Extremes. 
Deg. Deg. Deg. 
st trish... 44 Pitaetat st take 141 hours. 52.2 48.5-04,5 
PP OEIAU Oe Sos cw Shak s 168 hours, 48.2 45.38-50.7 
According to Thome * the lowest temperature at which maize 
will germinate is 59° F., or according to Sachs ¢ 48.9° F. 
Between the 168th and 180th hour, the Chester county Mam- 
moth germinated twenty-three kernels, or forty-six per cent, and 
during this interval the highest temperature was 47.6°, the lowest 
temperature 46.5°, the average temperature 47.4°, the range being 
but 1.1°. This goes to show that some varieties of maize can carry 
on changes involved in germination at a temperature of 47.6° F., or 
lower than the limits set by Sachs. During this last period of twelve 
hours, the thermometer was carefully read each hour, and the bulb 
happened to be placed within one of the pockets which contained 
this variety which showed first germination. From the 252d to the 
264th honr, the average temperature 47.1°, the extremes 46.4° and 
48.9°,no kernels germinated, but the dent corn had all been re- 
moved as germinated betore this. 
We will now offer the results of this germination trial in tabular 
form: 
oe 

*Text Book of Structural and Physiological Botany, New York, 1878, p. 193. 
+Text Book of Botany, by Julius Sachs, Oxford, 1882, p. 729. 
[Assem. Doc. No. 33.] 16 
