38, 
Colorado Experiment Station 
can be divided into two periods corresponding with the universally 
recognized divisions of development, the growing and ripening 
periods. The earliest samples were taken at the period of full 
bloom, 7 July; the latest samples were taken at the period of full 
maturity. 
Our object in this feature of our work had two phases, one to 
follow the changes in the plant during the two periods just men¬ 
tioned, and the other, the principal one, which we had in view, to 
determine the effects of the individual fertilizers upon the develop¬ 
ment of the plant and its composition. This is the reason why we 
used, in these experiments, no combinations of fertilizers. The ob¬ 
ject of this investigation as first proposed is to determine, if pos¬ 
sible, what factors or factor in our conditions it may be that de¬ 
termines the character and quality of our wheat. It may prove 
to be the case that we have no justification in fact for assuming that 
Colorado wheat has any general character so fixed and invariable 
as tq entitle it to recognition, either in a favorable or an unfavor¬ 
able sense. This is still, to me, though the concensus of millers 
and bakers is to the contrary, an open question. It seems to me not 
only possible, but very probable that the variation in the composi¬ 
tion and properties of samples of wheat grown on different lands in 
the same section may be as different as other samples from widely 
separated sections of the state or even from different states. In other 
words I doubt whether there is any standard which we can assert is 
characteristic of Colorado wheat. I must, however, acknowledge 
that the testimony of all the bakers that I have consulted is that the 
flour made from our wheats is an undesirable bread-making flour, 
falling from thirty to forty or more loaves per barrel behind flours 
which are first-class for this purpose. While these statements are 
somewhat anticipatory of subsequent work, the results of which 
are not yet known, they may not be wholly amiss in this place 
though we have presented no facts pertaining to the wheat, except 
those which it possibly may have in common with the plants, in re¬ 
spect to its nitrogen compounds. 
We may consider the results obtained with the four sets of 
samples taken prior to the 25th July as representing the period of 
development of the plant, and those obtained with samples taken on 
the 25th July and subsequent dates up to 6th August, as representa¬ 
tive of the changes during the ripening period. 
According to the results obtained by Wilfarth, Roemer and 
Wimrner, it is probable that our earliest samples were taken at 
about the period when the crop contained the maximum amount of 
nitrogen, and from this period on, if their observations be correct, 
both the percentage of nitrogen in the plant and the total in the 
