8 
1ST. C. Agricultural Experiment Station 
The relative number of flowers inclosed in each hag depends entirely 
upon the species to which the respective varieties belong. Generally 
speaking, *the flower clusters of Rubus villosus have relatively large 
numbers of flower buds, while those of R. trivialis usually possess from 
one to three. 
By covering the flower clusters before any of the buds had opened 
or immediately after the careful removal of such as had opened, thus 
preventing all foreign pollen from gaining access to the flowers within, 
the potency of the pollen within the imprisoned flowers was tested. The 
flower clusters of each variety were covered during the forepart of their 
respective blooming periods, and to insure a length of time sufficient for 
fertilization to manifest itself the bags were not removed until it became 
evident to the most casual observer whether a fruit had or had not been 
formed. When the bags were removed a careful study of the inclosed 
fruits was made and the data recorded. 
Results and Discussion. 
Dewberries .—The self-sterility work with the dewberries began with 
the planting of the varieties in the spring of 1908, and was finally com¬ 
pleted in 1915, thus retaining the plants under observation for a suffi¬ 
cient number of years to warrant conclusions. 
Fig. 2.—A fruiting branch of Manatee (dewberry.) 
