202 Offspriufi nf a Dirarf Hearinr/ Strain of Guinea Pifjs 



The proportion of iioniuil offsju-ing to dwarfs is 3:1. That the 

 mimbers in the total are in exactly this proportiijn is of course merely 

 a coincidence. 



The 2)repondei'ance of male dwarfs and of the total niuiiber of males 

 is very considerably diminishc<l since the last report. 



If we con.sider separately the offspring in i'ainilies in which the 

 dwarfs were all male, in those in which the dwarfs were all female ;ind 

 in those in which the dwarfs were of both sexes, we finil that the excess 

 of males is confined to the first set. of families, i.e. those in which the 

 dwarfs were all male. In this total the males are more than three 

 times as numerous as the females. In the earlier experiments most 

 of the families were of this kind; the diminution in the excess of males 



(2) FdiiiUifS contain.) tiAj divatfo of both t<e.i:es. 



offspring 



Parents Normal Dwarf 



Totals ... 39? 32 <r 11? 17 <f 



Total 50 ? : 49 <? . 



(•J) Fainilivti coiitainiiuj bcsitle)! iioriital uffspriiKj mnU dwarj/i only. 



Offspring 



Totals ... 17? 33 <? 21 <? 



Total 54 [f : 17 ? , a fairly close approximation to a 3 : 1 ratio. 



