54 
Colorado Experiment Station 
istics of our wheats by a study of general samples, because we have 
in them too great a variety of properties, and the effects of too many 
conditions, in part or wholly unknown to us. The big features of the 
climatic conditions have been asserted, but are not so well known that 
we^can state exactly in what these consist. The influence of the soil- 
factors has been recognized ib a general way, but has been consider¬ 
ed small in comparison with climatic influence^. Here again, neither 
the kind of effects, nor their extent have been made; out. It may be, 
and probably is the fact, that the wheat plant is very susceptible to 
very slight changes in the balance of its nutritive solutions, and at 
the same time very sensitive, especially at certain periods in its develop¬ 
ment, to unfavorable climatic influences. Further, it is' evidently very 
sensitive to the injury inflicted by some parasites, rust for instance. 
There may be differences in varieties in these respects, but there is no 
occasion for making modifications in these general statements, as 
they, in the main, seem to be correct* 
COMPOSITION OF WHEATS GROWN IN 1913 
The following tables present the composition of the wheats grown 
on our plots during the season of 1913, given by section and variety: 
