CXXXl 
abnormal individuals of the Aphis of the maple, and what part did 
they fulfil in the reproductive functions of the species to which they 
belong? They are evidently not males, since their generative appa- 
ratus retains the same rudimentary form at whatever epoch we 
examine them. Moreover, in no known species of Aphis are the 
males produced at the same time as the viviparous individuals, which 
are not the true females of the species. There is therefore no other 
alternative but to regard them as a modification of the specific type 
constantly reproduced, with the same characters, by the successive 
normal generations.” 
This, I confess, seems to me no satisfactory explanation of the con- 
stant production in a species of a form, very abnormal in appearance, 
which does not reproduce itself, which scarcely grows at all, is almost 
stationary, and, after living for several months, dies with the leaf on 
which it was born. This: curious instance of Dimorphism seems to 
offer a very promising field for further study, and I would specially 
recommend it to the attention of the Members of our Society. 
In conclusion, gentlemen, I cannot quit this chair without thanking 
you for the constant courtesy and support which 1 have met with 
from all during the two years that I have had the honour of presiding 
over you; more especially my thanks are due to the members of 
Council, and, above all, to my friend Mr. Dunning. 
It is a great satisfaction to me to feel that I shall be succeeded by 
my friend Mr. Bates, of whom we are all proud, by whose labours our 
Science has been so much advanced, and under whose Presidency 
our Society is, I think, sure to prosper. 
Mr. Pascoe proposed a vote of thanks to Sir John Lubbock for his conduct in the 
chair throughout his tenure of the Presidency, accompanied by a request that the 
adinirable Address just delivered might be published in the Society’s ‘ Journal of 
Proceedings.’ This was seconded by Mr. Grut, and carried by acclamation. 
Sir J. Lubbock returned thanks, and acceded to the request. 
The thanks of the Society were also voted to the other Officers, the Auditors, 
and the Members of Council for 1867, and were acknowledged by Mr. S. Stevens, 
Mr. Dunning, Mr. Janson and Mr, J. Jenner Weir. 
