3552 Notices of New Books : 



L. — Entomological instruments, &c. Mr. Kirby and Mr. 



Spence. 

 LI. — Investigation of insects. Mr. Kirby and Mr. Spence. 

 Appendix. — Mr. Kirby. 



[An enumeration of entomological works, and of papers in 

 Transactions, Journals, &c, drawn up by Mr. Spence, and ex- 

 tending in MS. to 126 pages large 4to., was unavoidably omit- 

 ted, owing to the much greater bulk of the work than had been 

 originally calculated on.] 

 " I beg to conclude this long note, which assigns to each, as far as 

 practicable, his share in the work, with a repetition of our desire, ex- 

 pressed in the Preface, — and which I know was Mr. Kirby's as much 

 as mine, — that in any reference to our work we maybe always jointly 

 referred to, with two exceptions : these are — 1st. The Letter on in- 

 stinct (Vol. ii.), and my farther remarks upon this subject (Vol. iv. p. 

 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 ex- 

 plaining 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 ad- 

 vert to it in the advertisement above quoted) was in opposition to his 

 opinions on the subject, and no portion of this Letter, nor of that on 

 instinct, was written by him. With these slight exceptions, no refe- 

 rence 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 re- 

 ferred to (often extending to whole paragraphs and several pages) may 

 have been supplied by the other, as perpetually occurs. It was, in- 

 deed, 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 com- 

 position of the work, amounting in quantity of matter, if printed, to 

 far more pages than its four volumes, were written by each. In fact, 

 there probably never was a work, composed by two authors, more tho- 

 roughly 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, 



