University of California Publications in Agricultural Sciences [Vol. 7 



determining the length, it is difficult to estimate the number of factors 

 involved. (See Hayes, 1912, p. 34.) Figure 1 shows the length 

 of leaves typical of the parent races, and typical leaves from the F^ 

 population. Figure 2 shows typical leaves from plants of the F, 

 generation. The drawings have been made from actual prints of 

 leaves on photographic paper and reduced equally in reproduction. 



TABLE 1 

 Showing Measurements of Length and Width of Leaves 



It should be stated that the plants of the Fo population were grown 

 in 4-inch pots while tho.se of the parent races and Fj population 

 were in 6-inch pots. However, the Fo plants were all grown under 

 uniform conditions so that the evidence of segregation in both leaf 

 length and number of lobes may be referred to genetic differences 

 among the Fo plants. 



