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University of California Ptihlications in Agrintltiiral Sciences [Vol. 7 



separated and form independent lobes attached to the mid-ribs. The 

 first of these is the major character because, without a tendency to 

 form the lobes, the rest of the factors could not express themselves. 

 But the remaining three subheads behave as separate groups of factors, 

 the depth of incision having an independent action on the leaf as do 

 the other two characters mentioned above. One thing, however, was 

 clear from the studies made, and that was the complex way in which 



(i 



Fig. 1«. A typical leaf of the race with long leaves and many lobes, g. A 

 typical leaf of the race with short leaves and few lobes, b-f. Typical leaves from 

 different plants of the Fj generation, c. X %• 



each of these characters was inherited. That these groups of charac- 

 ters are inherited in a Mendelian fashion cannot be doubted, but the 

 work has not advanced enough to estimate with certainty the number 

 of factors involved in these cases, except in the number of lobes, which 

 has been more extensively studied. 



The same families that furnished material for studying the inheri- 

 tance of length have been used for studying the lobe numbers. Table 

 3 shows the lobe numbers of the various families handled in this work. 

 The same illustrations, figures 1 and 2, show the nature of lobing and 

 the number of lobes. 



