182 THE MENDEL JOURNAL 



a twin-bearing stock and becoming pregnant five times, 

 gave birth to twins twice. It would almost look as 

 if, in a stock like this (and especially in one produced by a 

 union of two such families as are here sho\A'n), the twinning 

 tendency might be capable — even in the human subject— 

 of segregation as a definite unit-character. This, however, 

 is but conjecture. 



