366 
: STUDIES IN PLANT BREEDING 
in. The height of these plants varied from 6 to 22 inches, the 
mean height being about 14 inches. The great majority of plants 
produced only one pod each, five plants bore two pods each, 
and sixteen plants had no pods at all. The total number of seeds 
was 776, or on the average a little over two per pod. The seeds 
were less rounded and more irregular in form than the original 
sample—doubtless an effect of nutrition. 
400 of these seeds were sown on January 27th, for the second 
generation, and 388 plants were gathered in on March 17th. The 
mean height of the plants was about 15 inches, and the height s 
were rather more uniform. The plants bore 595 seeds in 397 
pods. 
400 of these seeds were sown on June 4th, and 327 plants were 
gathered in on July 26th. These plants produced 1,065 seeds in 
444 pods. The average height was only very slightly greate 
than in the previous generation and the seeds were similar 
*n form and size. Now Earliest Blue Pea as grown in England is 
described as being on the average 3 feet in height, and the crop 
be of course on quite a different scale from that which is here 
described—consisting of only two or three seeds per plant. 
The effect of climate shown in this case was exceptional in degree, 
but the immediate result and the preservation of the type of the 
first generation are points typical of all the kinds of peas examined 
METHOD. 
In making the following crosses, the stamens were in all cases 
removed from the flower to be pollinated previous to the opening o 
the anthers, and no case of erroneous self-pollination was recorded 
The flowers after they had been pollinated were covered with 
bags of parchment paper, chiefly for the purpose of protecting the 
buds thus prematurely opened, from the effects of rain and sun 
shine. 
In the succeeding generations the plants were in all cases left U 
themselves, no attempt being made to cover the flowers. In no case 
whether of a pure strain or of a cross-bred plant, was there any 
indication that anything but self-fertilization had taken place. 
