O. A. Merritt Hawkes 



267 



FIGURE 4. 



Shouniig thi-ee family i/roups {Trees A, B, C) in which there is persistence 



of the L toe-tyj)e. 



Tree A. 



r" 



I 



L 



? = c? 



c^ ? = (^ 



L L \ L 



? 

 L 



Four generations of L type. 

 Tree B. 



1. 



2. 



I i 



L I L 



A 



<? = 5 



Two generations of L type with the appearance of a B (one of the 

 exceptions mentioned in text). 



Tree C. 



2. 



3. 



Three generations with i)ersistence and dominance of Z, but the appearance 



of an A . 



