c 
COLORADO AGRICULTURAL EXPERIMENT STATION 
resent not only an individual plant, but as far as possible, a distinct 
individual type or strain for future study. At the present time there 
remain under observation, 121 distinct strains or types which have 
survived the conditions of winter and the vicissitudes attendant upon 
their growth and development. 
One of the next steps to be taken up in this work was to determine 
if these different strains appearing were pure line strains or whether they 
Plate No. 
5. 
would break up into mixed strains when the seed was planted for the 
next generation. Accordingly, three different plantings of each of 
these types have been made for progeny studies. This work is not yet 
ready for complete report, but has progressed far enough so that we 
can say that in the large majority of cases it has been found that each 
one of these strains was a pure line strain and bred true when the 
seed was planted, giving rise to a generation resembling the parent 
plant in habits of growth, color, size, root development and other ob¬ 
servable physical characteristics. 
In a few cases it was found that the progeny of an individual 
strain broke up into different forms. The supposition or the hypothe¬ 
sis upon which we are working is that these forms which show split¬ 
ting are crosses. The evidence is very strong in favor of this fact, 
