BIPARENTAL INHERITANCE IN PARAMECIUM 



453 



SO far as possible two lines of propagation, x and y; thus we have 

 in the complete case four lines of propagation from each pair. It 

 is in comparing the number of fissions in the lines descended from 

 a of a pair, with those descended from the other member b of 

 the same pair that the striking similarity is seen. The data are 

 given in table 49. 



It will be agreed, I think, that the resemblance shown between 

 the two members of pairs is astonishing. Compare for example 

 pair 3, where the number of fissions for a were 34 and 34, for b, 

 32 and 33, with pair 4, where the numbers are 13 and 12 for a, 

 12 and 13 for b; with pair 6, where the numbers are 16 and 10 



TABLE 49 



Experimenl 15. Paramecium caudatum. Numbers of fissions during a period of 

 2^ {21) days, for the progeny of the two members, a and b, of the pairs {conjugation 

 completed), and for the split pairs {conjugation not co7npleted). Each member is 

 represented, when 2)ossible, by two independent lines of j>ropagation, x and y. 



