THE WEEKLY ENTOMOLOGIST, 
93 
“Manual,” 167, 178, 183, 187, 
212, 221, 226, 228, 229, 268, 270, 
296, 313, 319, 320, 323, to 327, 
362, 389, 391, 394, and 400,— and 
several of the Geometrce. If any of 
my wants are supplied, I will pay 
return postage, — the rest I shall be 
glad to distribute gratis. Heney 
Moore, 23 Berners Street, Oxford 
Street, London. W. 
Insects to exchange. I have a few 
series of X Citrago, X. Scolopacina 
and P. Chi, bred, that I shall be 
very glad to exchange with any friend 
that has either larvae, pupae or irnagos 
to spare of any of the lollowing. 
A. Cratcegi. 
L. Sibylla. 
A. Iris. 
M. Cinxia. 
T. Betulce. 
T. Pruni. 
P. Adonis. 
S. Tilice. 
S. Convolvuli , 
C. Elpenor. 
C. Porcellus. 
T. Formicceforme. 
A . VillicQ. 
C. Reclusa. 
C. Curtula. 
II. Dominula. 
C. Nupta. 
Chakles. Btjbgess, 72 Verdon 
Street, Sheffield. 
Free Offer. I shall shortly have 
larvae of Piston Hirtaria. If any of 
your readers want some, I shall be 
happy to supply them on receipt of a 
box prepaid, and return postage. R. 
A\ r . Weight, Morland House, Well 
Street, Haclcney, London, X. F. 
THE MUTABILITY OF SPECI- 
FIC OR RACE FORMS. In No. 9. 
Vol 1. of the “ Weekly Entomologist” 
we gave some extracts from a report 
of the Northern Entomological Society 
at which a paper on the' above subject 
was read from Mr. E. Brown of Bur- 
ton-on-Trent. Asthispaperhas excited 
much discussion and many of our 
readers, probably, have not seen it 
we now proceed to report it. 
“ The question how did species 
originate has suddenly become the 
most absorbing scientific topic of the 
day but it is doubtful whether we are 
ever likely to arrive at more than the 
barest inferential evidence touching: 
the origin properly so speaking of spe- 
cies or in other words at a knowledge 
of the earliest differentiation of forms 
when first inanimate matter became 
animated. If however the phrase ori- 
gin of species be considered to relate 
only to the assumption by animals and 
plants of those exact forms which they 
now present to our observation it is 
tolerably certain, that careful reason- 
ing from exact data will lead ultima- 
tely to correct notions as to the 
relationship, by descent, of races, and 
consequently to the origin of existing 
so called species. Many years before 
Darwin promulgated his doctrine of 
Selection of Races I had formed my 
own conclusion relative to the non- 
fixedness of species and being unable 
to find any support in nature to the 
