10 Darwin, and after Darwin. 
Indeed. while re-casting this portion of my lectures 
for the present publication, I have felt that criticism 
might be more justly urged from the side of im- 
patience at a reiteration of facts and arguments 
already so well known. But while endeavouring, as 
much as possible, to avoid overlapping the previous 
expositions, I have not carried this attempt to the 
extent of damaging my own, by omitting any of the 
more important heads of evidence ; and I have sought 
to invest the latter with some measure of novelty by 
making good what appears to me a deficiency which 
has hitherto obtained in the matter of pictorial illus- 
tration. In particular, there will be found a tolerably 
extensive series of woodcuts, serving to represent the 
more important products of artificial selection. These, 
like all the other original illustrations, have been 
drawn either direct from nature or from a comparative 
study of the best authorities. Nevertheless, I desire 
it to be understood that the first part of this treatise 
is intended to retain its original character, as a merely 
educational exposition of Darwinian teaching—an 
exposition, therefore, which, in its present form, 
may be regarded as a compendium, or hand-book, 
adapted to the requirements of a general reader, or 
biological student as distinguished from those of a 
professed naturalist. 
The case, however, is different with the second 
instalment, which will be published at no very distant 
date. Here I have not followed with nearly so much 
closeness the material of my original lectures. On 
the contrary, I have had in view a special class of 
readers ; and, although I have tried not altogether to 
sacrifice the more general class, I shall desire it to be 
