( ‘xxix ) 
offensive juices directly from the poisonous properties of 
their food in the early state. 
In Part 2* a lengthy account is given of the cases of 
mimicry occurring throughout the class of insects, and 
reference is also made to the few known instances in other 
classes of animals. The Lepidoptera occupy the bulk of the 
memoir, and, as in Part 1, a geographical order is followed, the 
mimicries in each of the four zoological regions being given 
under their respective families and genera, but in separated 
accounts of (firstly) models, and (secondly) mimickers. 
In the ‘‘ Allgemeiner Theil’’ which concludes the work, and 
occupies about half of Part 2, there are sections treating of 
mimicry (a) within the limits of the old genus Papilio (in 
connexion with Part 1), (b) between ‘‘immune and non- 
immune” Lepidoptera, and (c) among ‘‘ immune” Lepido- 
ptera themselves; followed by a consideration of objections 
to the theory of mimicry, and of mimicry as a part of 
protective adaptation to the environment. 
While I regard Part 1 as a memoir of value, and as 
likely to prove serviceable to the student of a group so 
difficult to classify as the Papilionine, and while I recognize 
the great labour and research displayed throughout the work 
in the assembling of the accessible facts and data, I must 
reluctantly record my concurrence in Prof. Poulton’s severe 
criticism of the extremely unsatisfactory nature of the general 
treatment of the subjectin Part 2. Apart from the cumbrous 
handling of the mass of details accumulated, the writer mani- 
fests such disregard of obvious difficulties, such unscientific 
haste in jumping to conclusions, and such inadequate recogni-— 
tion of what had been accomplished by previous investigators, 
that one can only regret that he ever entered on the speculative 
part of his work, and did not confine his energies to the 
better concentration and arrangement of the materials so 
assiduously collected. 
Among recent contributions to the subject, we shall, I 
think, all agree in assigning a high place to the memoirs 
with which Dr. I. A. Dixey has enriched our ‘ Transac- 
* Subtitle, ‘‘ Untersuchungen tiber die Mimicry.’’ 
