1885.] MR. J. STOLZMANN ON SEXUAL DIMORPHISM. 421 



Alay 5, 1885. 

 Prof. W. H. Flower, LL.D., V.P.R.S., President, in the Cliair. 



The Secretary read the following report on the additions to the 

 Society's Menagerie during the month of April ] 885 : — 



The total number of registered additions to the Society's Mena- 

 gerie during the month of April was 132, of which 33 were by 

 presentation, G6 by purchase, 12 by birth, one by exchange, and 20 

 were received on deposit. The total number of departures during 

 the same period, by death and removals, was 1 1 7. 



The most noticeable additions during the month of April were as 

 follows : — 



1. A pair of Rhinoceroses, apparently referable to the Sumatran 

 species. Rhinoceros sumatrensis. These are young animals, perhaps 

 about three quarters of their full size, and form an interesting 

 acquisition as being the first pair of any species of this genus that 

 have been together in the Society's Menagerie. 



They were purchased of Mr. Cross of Liverpool on the lOth of 

 April for the sum of 36*500. 



2. A female Tibetan Wild Ass or Kiang (Egiiits hemionus), depo- 

 sited by Mr. AY. Jamrach on the 7th of April. This is the only 

 example of this species of Wild Ass that we have liad in the Gardens 

 since the specimen presented by the late Major W. E. Hay in 1859'. 



3. Two Gouldian Grass-Finches (-Poe/j////« (/owW/a'), one adult and 

 one in young plumage, but both i^npposed to be of the male sex, 

 presented by Mr. C. N. Ro&enfeld on April 18th, and new to the 

 Society's collection. It is possible that the controversy respecting 

 the coloration of the sexes of this species " may be settled upon the 

 death of these specimens. 



The following papers were read : — 



1. Quelques remarques sur le Dimoi-pliisme Sexiicl. 

 Par Jean Stolzmann \ 



[Received March 3, 1885.] 



La theorie du transformisme a occupe, dans ces derniers temps, une 

 place des plus importantes dans la science, formant, pour ainsi dire, 

 la base des sciences biologiques. II y a cependant une ecole de 

 naturahstes qui s'opposent encore a 1' accepter, probablement sous 

 I'influence des anciennes traditions. Neannioins toute la nouvelle 

 generation des savants a accepte la theorie de Darwin avec un 

 enthousiasme extraordinaire, la prenant pour point de depart pour 

 toutes les questions de la philosophic naturelie. La majorite des 



1 See P. Z. S. 1859, p. 305, pi. Ixxiii. 



^ See Gould's ' Birds of Australia,' vol. iii. plates 88 and 89. 



^ Communicated bj M. L. Taczanowski, C.M.Z.S. 



Proc. Zool. Soc— 1885, NiJ-JQLVIII. 28 



