studies of Teratological Phenomena. 



113 



difficulties in classifying the three kinds of segregates were greater than 

 in 301 X 373, heterozj^gotes very often being classed as normals, until 

 repeated inspections had taught me to look the whole plant over carefully 

 for abnormal flowers. Individuals with fasciated stems occurred in a 

 proportion of about 1 F to 9 N, whereas one would expect 3 to 1. 

 353 differs very markedly in character from 301, and one might almost 



a Fig. 23. b 



a) Fj plant with 18 leaves (301—1 X 353—3). 



b) F^ AA segregate with 100 leaves. 



say dozens of these differences had segregated, so that the F2 generation, 

 owing to the many new factor combinations, represented an extremely 

 variable population. Variation in height ranged from 10*7 to 24*4 dem., 

 and the leaf count from 13 to 212 leaves per plant. The relation 

 between these characters is shown in Table 23. The segregate 

 bearing 212 leaves was 17 '54 dem, high and had a very fasciated stem, 

 while the one with 13 leaves was 16 "8 dem. and normal -stemmed 

 (Fig. 23 and 24). Table G gives the frequency distribution of height in deci- 

 meters and number of leaves per plant for 24 apparently normal segregates. 



Induktive Abstainmungs- und Vererbungslehre. XVI. 8 



