42 
was well illustrated by certain butterflies—the nauseous and the 
non-nauseous—flies and bees. The last slide represented a cat 
and dog facing each other—the cat representing defence by 
attitude, showing that all our most familiar animals were worthy 
of notice and of thought. (Cheers.) 
An interesting discussion followed, and was taken part in 
by Messrs. J. 8. Sutcliffe, H. Roe Kerr, and H. L. Joseland, M.A., 
who moved a hearty vote of thanks to the Lecturer for his 
fascinating lecture. Mr. W. Thompson seconded, and Mr. G, 
Gill supported, hoping it would not ke the last time they had the 
opportunity of hearmg Dr. Ashworth. 
The Secretary, Mr. Crossland, did not think they had ever seen 
a more perfect set of slides. 
In reply, the Lecturer dealt with points raised in the discus- 
sion, explaining more fully the apparatus by which the change 
in colour was brought about. There was an intimate communi- 
cation with the apparatus and the mass of peculiar organs known 
as chromatophores, full of pigment, which could be distributed 
through the tissues by the pigment cells. 
He doubted whether English grouse taken to other countries 
would survive. In mimicry it was the insect which was good to 
eat that mimicked the one that was not good to eat. It was 
probable that insects did not see as we do. He had had the 
pleasure of looking through a fly’s eye, by which they could gain 
an idea of what the fly saw. They formed an image similar to 
that we see, but whether the uervous apparatus of the fly was 
capable of appreciating colour as we do, was not settled. 
