3° They are peculiarly liable to affect the female sex; 
4° They are, as a rule, found only between compatriot species; 
5° They may affect the seasonal phases of a dimorphic Insect 
differently; 
6° The likeness produced is merely superficial ; 
7° The same visual effect may be brought about by different 
means; 
8" The degrees of resemblance between the different forms and 
also their relative numbers vary indefinitely; 
9° The mimetic pairs or combinations are not sharply isolated, 
but are connected by gradation. 
No explanation of these phenomena founded in the supposed 
direct influence of external or internal conditions seems free from 
serious difficulty. The only interpretation at present feasible 
appears to be comprised in the well-known theories of Bates and 
Fritz Müller, which are compatible with all the points that 
have been enumerated. The facts of mimicry may therefore be 
considered to take their place among the wide range of phenomena 
which exist under the control of natural selection. (Vol. II, 
Mémoires, p. 369.) 
Le Président remercie M. Dixey pour son intéressante confé¬ 
rence; les travaux de l’auteur sur le mimétisme sont trop connus 
pour en faire un éloge ici. 
Il donne la parole à M. R. C. Punnet, qui parle sur le : 
Mendelisme. 
(Résumé.) 
The experimental study of heredity, upon which much work has 
been done since the rediscovery of Mendel’s paper, has shewn 
that in very many cases the characters of Animals depend upon 
definite entities in the germ-plasm, which are transmitted according 
to definite and well-ascertained rules. A simple example among 
Lepidoptera is the inheritance of Angerona pritiiaria and its 
variety sordidata. Where more than one character is transmitted, 
they each follow the same rule, but behave independently, as is 
