In all the varieties there was a great falling ofif in the rate of 

 increase immediately after the tassels are put forth, the plant 

 evidently accumulating dry substance much more rapidly while 

 the. tassels were being developed than at any subsequent pe- 

 riod. 



Table F shows the computed amount of total crop and of 

 each constituent of the crop per acre for each variety and each 

 period. The general indications of this table have already 

 been noted. In the final results at harvest time it appears 

 that the Southern corn produced the most dry substance per 

 acre, also that the Northern field corn came next, Pride of the 

 North next and Sanford last, but as was shown in Bulletin 2 

 the feeding results show best for Sanford, the Northern coming 

 next and the Southern last. The Pride of the North was not 

 experimented with in feeding. 



Just why the economy of the three varieties should be the 

 reverse of their product per acre is a question hard to answer. 

 In the case of the Northern field corn it was fed to cows that 

 had been long in milk, and therefore the natural shrinkage 

 would make the cost per quart of milk greater even on the 

 same food, and it is fair to presume that under like conditions 

 there would have been no great difference in feeding value, but 

 why the Sanford should prove so much the superior of the 

 Southern can only be attributed to the fact of its being a mature 

 plant while the rank and late Southern corn was immature, and 

 although chemical analysis shows them to have been nearly 

 alike, yet the condition of the nitrogenous matter may have 

 been such that pound for pound it was less valuable. This 

 point could only have been determined by separating the al- 

 bumenoid from the non-albuminoid nitrogen. 



In conclusion we may say that, all things considered, it is 

 best to plant such varieties as will in a given locality produce 

 plants having well filled ears, the kernels being in the milk or 

 better still in the "doughy" state, and to delay the harvesting 

 until the plant shows evident signs of ripening such as the 

 turning of the lower leaves, the glazing of the kernel in the 

 flint or the shrivelling of the dent varieties. Up to this point 

 there is a gain in two ways : firs^t, an actual gain in the dry 

 matter as shown by Table F, and second, a loss of water, (see 

 Table A) reducing the ratio between the water and dry sub- 



9 



