( Ixx ) 



and probably in a large proportion of cases, it was not hard to 

 determine tbe proportion of apparent dominants (viz. true 

 dominants + heterozygotes) to recessives, altliougli it might 

 well be laborious to ascertain the numerical relationship 

 between true dominants and heterozygotes. I therefore 

 asked Mr. Hardy whether his method would not give this 

 relationship when the proportion between apparent dominants 

 and recessives was known. Mr. Hardy had kindly replied : — 

 " What you say seems to me perfectly correct : viz. that if 

 the ratio of apparent dominants to recessives is observed and 

 found to be constant, then my condition enables you to assign 

 the ratios true dominants : heterozygotes : recessives — and 

 your numerical illustration seems accurate." 



It was probably safe to assume that on the W. Coast dionysus, 

 an apparent dominant, was somewhere between 5 % and 1 % 

 of hippocoon, the recessive, and that the rarer forms at Chirinda 

 also lay between these extremes. Assuming 5 %, Mr. Hardy's 

 equations gave almost precisely ^ % true dominants, 4| % 

 heterozygotes, and 95 % recessives. Thus with 5 % apparent 

 dominants only 1 individual in 20 would be a true dominant. 

 With 1 %, the proportions were almost exactly y^ %, 1 %, 

 and 99 % respectively ; and only 1 apparent dominant in 

 100 would be a true dominant (homozygous). 



A LARGE FAMILY OP HyPOLIMNAS (EuRALIA) MIMA, TrIM., 

 AND WAHLBERGI, WaLLGR., BRED FROM KNOWN PARENTS OF 

 THE WAHLBERGI FORM AT DuRBAN, BY E. E. PlATT. — Prof. 



PouLTON exhibited a male and female wahlhergi, taken in 

 coitu, on Dec. 28, 1913, by Mr. E. E. Piatt, of 403 Essenwood 

 Rd., Durban, together with a portion of the family reared 

 from the eggs laid by the female. This was the first time 

 that both parents of a family of this species had been secured ; 

 and the results suggested that the female may also have paired 

 with another male of the mima form. It was at any rate 

 probable that wahlhergi was a Mendelian recessive (Proc. Ent. 

 Soc, 1910, p. xvi, n.), while Mr. W. A. Lamborn had in 1911, 

 by breeding a large d\\-dubia, Beauv., family from a female 

 of the anthedon, Doubl., form (Proc. Ent. Soc, 1912, p. iv), 

 rendered it almost certain that the latter — the western repre- 

 sentative of wahlhergi — was recessive. Hence from a male 



