April, 1915.] The Inheritance of Size in Tomatoes. 487 



The fruits of the F-2 series 15-11-2 gave the followino: average 



The average weight of fruits of this series is 2.58 grams. 



These four series of F-2 generation hybrids give a total of 44 

 F-2 plants whose average fruit-weights vary from 1.33 grams to 

 4. 10 grams. The lightest fruit possessed a weight of .38 gram 

 while the heaviest fruit weighed 5.63 grams. The variability of 

 the F-2 fruits was greater than that of the F-1 fruits. The aver- 

 age fruit-size of the F-2 generation plants agrees fairly well with 

 the average of the fruit-size of the parent F-1 generation. Dis- 

 tinct segregation of size characters was noted in the F-2 fruits. 



The following table shows the average fruit-weights of the 

 plants of the F-3 generation (17-12-4): 



17-12-4. Plant 



In this generation segregation of size characters of fruit was 

 observed. The average weight of fruit for this generation was 

 found to be 2.62 grams. The variability and generation average 

 are practically the same as in the F-2 fruits. 



From plant 10 of the F-3 series came the seeds which produced 

 the plants of the F-4 generation (43-14-2). This generation was 

 grown in the garden. The average fruit weights of the different 

 plants are as follows: 



Segregation of size characters of fruit occurred in this F-4 

 generation. Both variability and the average size of fruit of the 

 generation are somewhat less than in the F-3 fruits. 



