678 THE AMERICAN NATURALIST [Vol. LI 



and grandam is .0114 + .0167, a difference insignificant, 

 hence one can not assume sex linkage. 



Examination of Shropshire Data from the Mendelian 

 Standpoint 



A number of Shropshire pedigrees were tabulated which 

 were all started from triplet births. It had seemed from 

 inspection that triplets might be genetically different from 

 twins and singles, hence the pedigrees were tabulated to 

 discover such a difference if possible. If the maternal 

 grandparents affected the number at a birth from their 

 daughter, then it was possible that certain differences 

 might appear in the pedigrees indicating the genetic ef- 

 fects. The results follow. 



TABLE XXIV 



TABLE XXV 



Materxal an\^ i' • T M '.TrnxAi. Grandam a Single 



