136 



Rk IIAKD M. FRAPS 



Table 2. Lag (in hours) in Ovulation Sequences of 2 to 6 Members, 

 BASED ON Times recorded in Table 1* 



* From Fraps (17). 



The solid columns of each vertical bar measure lag, in hours (ordinates), 

 between successive ovulations; the solid plus superimposed open columns 

 measure the cumulative lag at third and subsequent places in the several 

 sequences; total lag is so indicated at the last place in each sequence. 



CO 



a: 



O 



< 



SEQUENCE LENGTH 



Fig. 1. Lag in ovulation sequences of 2 to 13 members. Solid bars, lag at successive places 

 in each sequence; solid with lined bars, cumulative lag. (From Fraps (17).) 



Several characteristics of ovulation sequences are illustrated by these 

 histograms. The greatest value of lag appears in the two member sequences, 

 where there is, of course, only one place of lag, that between first and second 

 ovulations. In all other sequences the greatest value of lag is between first 



