(111, ~) 
of forms widely separated in colours, patterns, shape, relation 
of upper- to under-side, etc., and even instinct, including 
the selection of a particular type of country. 
The PrestpENT also showed a small series of ants, part of 
a much larger collection made by the late W. J. Burchell in 
Brazil between the years 1825 and 1830. They were obtained 
with his other vast zoological and botanical collections at Rio 
or its neighbourhood, or in the course of the long journey from 
Santos to Parad. Considering their great age the specimens 
were wonderfully well preserved and are accompanied by 
remarkably exact and detailed data, and, in many cases, 
interesting notes on habits, instincts, ete. Hardly anything 
in the whole of the zoological material, all of which was pre- 
sented by Miss Anna Burchell to the University of Oxford 
in 1865, has as yet been published. Arrangements were now 
being made to ensure that these interesting results may, with 
as little delay as possible, be given to the scientific world. 
The Presipent, Professor E. b. Poutton, gave a summary 
of his paper on the effect of lichen-covered bark, etc., upon 
certain Lepidopterous larvee. He explained that these results 
were now being brought forward about ten years after the 
experiments had been begun. The delay was to be explained 
by the disorganization of the library and papers of the Hope 
Department during the building operations in 1894. As a 
result the notes of the Professor and Mr. Holland, as well 
as the beautiful water-colour drawings made by Mr. P. J. 
Bayzand, were mislaid, and when everything necessary had 
been recovered the press of other work for a time prevented 
this memoir from being undertaken. 
The chief object of the investigation was to test the efficiency 
of lichen-covered bark as a stimulus for the production of a 
lichen-like appearance in certain larve. It was found that 
Gastropacha quercifolia was highly sensitive to such a stimulus 
up to the beginning of hybernation, but that during and 
after hybernation, all such susceptibility entirely ceased. The 
larvee were also sensitive, during the same period, to brown 
and black bark, which caused the appearance of corresponding 
tints. In all experiments the food made use of was the same, 
viz. the leaves of the hawthorn. 
