
39 
Mean of maxima and minima air thermometers. 
1882. 1883. 1884. 1885. 1886. 
Max. Min. Max. Min. Max. Min. Max. Min. Max. Min, 
PITS Os an 75.8 54.7 76.1 56.6 78.6 55.2 74.1 58.0 75.1 863.2 
Ea aie RARE 80.0 68.4 77.2 67.6 75.5 57.1 79.5 59.8 78.7 57.3 
UC | 80.1 58.0 76.1 55.0 81.5 58.2 73.7 56.3 77.4 57.4 
June and July .. 77.9 56.5 76.6 57.1 77.0 56.1 76.8 56.4 %6.9 55.2 
July and August. .80.0 58.2 76.6 56.3 .78.5 57.6 76.6 58.0 78.1 57.3 
June, July, Aug..78.6 57.0 76.5 65.4 78.5 56.8 75.8 56.4 77.1 55.9 
The average yield of corn, as recorded for plats treated 
alike during four of these years, was 
Average corn crop. 
het sk cl ie ay Uae Ie ME 00.2 bushels per acre. 
BOLE OeCN Ns sha? alka LUX ‘ais 58.6 a ry 
LT otk EAN RM a Eel eA re 63.8 y if 
We eo) ee Pe OA A aa 58.8 e 
The figures of crop are not absolute, as the water contents 
at harvest vary greatly, and hence the crop in an unfavor- 
ably cool year is recorded as larger than it really is in com- 
parison with a well ripened harvest. 
In 1882 the corn was fairly ripe; in 1883 rather moist but 
could be safely binned ; in 1884 well ripened; in 1885 very 
moist and had to be moved in the bin to prevent moulding. 
In 1882, 76 lbs. of ear corn made a bushel of shelled corn; 
in 1883 it required 80 lbs. In 1884, a sample analyzed 34 
er cent. of water. In our report of crops we have calcu- 
ated to 80 lbs. of ear corn to the bushel. 
In 1883 and 1885, the mean of the maxima temperatures 
of July and August the same, viz: 76.6; the crop the same, 
viz: 58.6 and 58.8 bushels, and these years of unripeness. 
In 1882 and 1884, the correspondences between crop and 
temperature do not seem to obtain except as between the 
two years. The figures show: 
1883. 1885. 1882. 1884, 
Mean soil temp. Aug. 63.5 67.5 67.8 71.4 
Mean max. temp. Aug. 76.1 73.7 80.1 81.5 
Crop harvested, bushels 58.6 58.8 50.2 63.8 
Notwithstanding the discrepancy in 1882, the figures seem 
to suggest that there is a close relation between tempera- 
ture and crop, and that corn requires a high mean tempera- 
ture, and high maximum temperatures for its best yield. 
With potatoes, our experience shows the following ré- 
lations between temperature and crop, the variety being the 
same, and the conditions being as nearly alike as we could 
select from our data. In 1885, a season of rot, the figures 
are somewhat under the real yield for the purposes of this 
comparison . 
1883. 1884. 1885. 1886. 
Mean soil temperatures, June, July, Aug. 64.1 70.5 69.7 70.63 
Average crop, single eyes for seed, bus. 314 183 169 128 
‘f 
