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the frost,^ and that its growth is most rapid during the 
month of September. To ascertain whether the same was 
true for Colorado the following experiment was planned: A 
plat containing 600 hills of Red Cob corn was divided into 
halves, Septmnber 5th, by cutting alternate hills diagonally 
across the piece. The 300 hills cut, weighed 1,642 pounds, or 
thirteen tons per acre. The corn contained 22.80 per cent, 
of dry matter, or 2.96 tons of dry matter per acre. 
On September 29th the other 300 hills were cut, and 
weighed 1,555 pounds. It contained 23.90, per cent, of dry 
matter, or 2.94 tons of dry matter per acre. Thus it had 
dried out a little, and the increase in per cent, of dry matter 
just balanced the decrease in weight. 
During these three weeks, that were expected to show 
great growth, the plant had practically remained without 
gain. The days were hot but the nights so chilly that the 
cold seems to have checked the growth of the corn, although 
the slight frosts that occurred on several nights scarcely 
touched the ends of the leaves. 
The figures seem to show that, in this part of Colorado, 
so near to the foothills, corn cannot be depended on to grow 
after the first week in September, and such varieties should 
be chosen as will reach the glazing stage by that time. 
