598 APPENDIX. 
two orders Coleoptera and Hymenoptera, are really homologous. When 
at Barham, we had decided to regard Mr. Kirby’s Collare of his ‘“ Mo- 
nog. Apum Ang,,” as he had then considered it, as the equivalent of the 
so-called ¢horaw in Coleoptera; but on reaching home, and dissecting 
many insects of the two orders, I was led to suspect we had decided 
wrongly ; and the anatomical facts on which my doubts rested, are de- 
tailed in the preceding letter of Nov. 20 (p. 588.). Mr, Kirby, it will 
have been seen, in his reply (p. 592.), adhered to his original opinion ; 
and the discussion on this knotty point was continued at great length, 
by reference to dissections we had made with this view, and arguments 
built on them, in the eight or ten letters which we exchanged in the 
spring of 1810, without conviction on either side: but a letter from Mr, 
Kirby, dated May 14, begins as follows, with an admission that he had 
seen reason to come over to my way of thinking on this subject, — an 
admission my candid friend could well afford to make, seeing how often 
he had convinced me of error, and brought me to adopt his views on 
points on which we had differed and as thoroughly discussed as this : — 
“Barham, May 14, 1810. 
“My Dear Sir, —I began a letter to you before breakfast this morning upon 
a common sheet of paper, because I did not expect to have matter to fill a 
folio. I had not proceeded down one side before your letter arrived, the reply 
to which will, I think, enable me-to eke out this 74, and therefore I shall begin 
anew. You probably got my letter the day afte yours was despatched, which 
I hope set your mind at rest on that score. My object in writing again so 
s00n was to express to you my full conviction that you are perfectly accurate 
which I know was Mr. Kirby’s as much as mine,—that in any reference to our work 
we may be always jointly referred to, with two exceptions: these are — Ist. The 
Letter on instinct (Vol. 11.), and my farther remarks upon this subject (Vol. IV. 
pp. 19—33.), on which Mr. Kirby differed in opinion from me, as he has stated in the 
advertisement to Vol. III., and for taking which different view from mine he has 
given his reasons at large in the Bridgewater Treatise (Vol. II. p. 222—280.); and 
2nd. The Letter on hybernation (Vol. II.), in which the denial of the possibility of 
satisfactorily explaining the retreat of insects to their winter quarters, and often the 
preparing of these previously, from the mere direct sensation of cold, I think it due 
to him to state (though he did not himself care to advert to it in the advertisement 
above quoted) was in opposition to his opinions on the subject, and no portion of this 
Letter, nor of tha: on instinct, was written by him. With these slight exceptions, no 
reference to our book can ever be justly made except in our joint names; for the 
chances are, that even in the Letters here stated to have been written by one of the 
authors, the particular facts or observations referred to (often extending to whole 
paragraphs and several pages) may have been supplied by the other, as perpetually 
occurs. It was, indeed, next to that of criticising and perfecting our anatomical 
and orismological terms, expressly for the purpose of thus adding to the stores of 
his coadjutor, that the greater part of the long letters that passed between us, during 
the extended period employed in the composition of the work, amounting in quantity 
of matter, if printed, to far more pages than its four yolumes, were written by each. 
In fact, there probably never was a work, composed by two authors, more thoroughly 
dove-tailed with the contributions of each, than ours. Our book was always in our 
thoughts; and our reading, even on dissimilar subjects, was constantly furnishing 
facts, or hints, or illustrations, bearing on the portions of each other, which were 
duly noted and transmitted, and most generally adopted: and, if it have merit, this 
is in a great degree owing to its being what it professes to be —a really joint pro- 
duction of two variously-instructed minds, anxious only to contribute to the per- 
fection of their labour of love, —for such the worl truly was to them, — during the 
many years it occupied them, 
