APPENDIX. 597 
It will have been observed that, in our letters of Nov. 20 and 27, 1809, 
a discussion is begun as to what portions of the thorax (Linn.), in the 
XXV.—Luminous insects. Mr. Spence. 
XXVI.—Hybernation and torpidity of insects. Mr. Spence. 
XXVII.—Instinct of Insects. Mr. Spence. 
Vou. IIT. 
LETTERS. 
XXVIII.—Definition of the term insect. Mr. Krrey and Mr. Spence. 
XXIX. to XXXII.—States of insects. Mr. Kirpy and Mr. Spenor. 
These four letters were originally assigned to Mr. Spence, 
and rough copies of them were prepared by him, extending 
to 120 pages of MS, in large 4to,; but owing to his ill health 
(as explained in the advertisement to Vol. IIT.), the accumu~ 
lation of new matter required the whole to be prepared for 
the press by Mr. ener | 
XXXII. to XXXVI.—External anatomy of insects. Mr. Kirsy and Mr. Spence. 
{This department of the work, as has been previously here 
explained and in the advertisement to Vol. ILI., was that to 
which the authors, both during Mr. Spence’s visits to Bar- 
ham and in their long subsequent correspondence, mainly 
devoted their attention; and the tabular view of the parts of 
insects was the very first portion of the work drawn up by 
them as the result of their joint examination of a great 
number of insects of all orders, and of long discussions (both 
orally and by letter) as to their homological relations: but 
the more extended and connected survey of the whole subject 
contained in those letters was drawn up by Mr. Kirsy. ] 
Vor. IV. 
LETrers. 
XXXVII. to XLIII.—Internal anatomy and physiology of insects, Mr. Krrsy and 
Mr. Spence. 
(‘The explanation given above as to the letters on the 
states of insects, applies equally to these seven letters on their 
internal anatomy and physiology. They were originally as- 
signed to Mr. Spence, whose rough draughts of the letters fill 
125 MS. 4to. pages; but it was necessary, in consequence of 
his ill health, that the whole should be prepared for the press 
by Mr. Kirby, so as to incorporate the new facts with those 
which Mr, Spence had collected. ] 
XLIV.—Diseases of insects. Mr. Kresy. 
XLYV.—Senses of insects. Mr. Kirny. 
XLVI.—Orismology, or explanation of terms. Mr. Kinny and Mr. 
SrEeNncr. 
XLVIIL—System of insects. Mr. Kirpy. 
XLVIUI.—History of Entomology. Mr. Kirpy and Mr. Spence. 
XLIX.—Geographical distribution of insects, &c. 
all: first part, on general geographical distribution, by Mr. 
iRBY; the remainder by Mr, Krrey and Mr. Spence. ] 
L.—Entomological instruments, &c. Mr. Krrpy and Mr. SrpeNcE. 
Li.—Investigation of insects. Mr. Kirsy and Mr. Spence. 
Appendix.—Mr. Kirey. 
{An enumeration of entomological works, and of papers in 
Transactions, Journals, &c., drawn up by Mr. SpENcr, and 
extending in MS. to 126 pages large 4to., was unavoidably 
omitted, 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 poe his 
share in the work, with a repetition of our desire, expressed in the Preface, — and 
aes 
