204 OffspriiHj of a Dvarf Bearlmj Strain of Guinea Pigs 



the previous report, as a case of parti;il sex linkage. His explanation 

 accounts for the occurrence of some families containing besides normal 

 offspring male dwarfs only, others containing besides normal offspring 

 both male and female dwarfs. According to his scheme there would be 

 no complete families containing none but female dwarfs. So tar there 

 may be nothing to conflict with the facts, but as far as I can see, in 

 both his families the numbers of the sexes would be equal, though he 

 does not seem to recognise this difficulty himself (.see p. 515). 



The experiments will be continued by Miss N. M. and Mr J. B. S. 

 Haldane. 



