ORXITHOLOGICAL BIBLIOGRAPHY. 223 
Other essays and papers that may come under this class, 
scattered in the Transactions of Societies both at home 
and abroad. We must again repeat, that to complete 
these lists by noticing all incorporated papers of this 
description would extend this part of our volume to a 
most disproportionate length. 
(180.) Our fifth and last section contains such works 
as are more especially intended to illustrate the science 
by coloured plates ; they are necessarily, on this ac- 
count, of the most expensive description, and are there- 
fore aptly termed by the French Ouvmges de. luxe. 
Some few, being of the nature of monographs, have 
lieen already alluded to, and others, like the African 
birds of Le Vaillant, and those of India by Gould, 
■would have been inserted, did they not decidedly be- 
long to geographic ornitliology. These are the works 
which should be in all jiublic libraries whose funds 
are equal to their purchase ; and they should be ne- 
cessary accompaniments to public museums intended 
to advance zoological science. Unfortunately, however, 
such institutions in England are remarkably deficient 
in this respect ; so that it has become almost impos- 
sible for the naturalist to prosecute his studies success- 
fully, without iiicuring an expense so enormous that 
few private incomes can support. We have heard that 
the Zoological Society, the richest in this country, and 
that above all others which should possess a princely 
library in its own department of science, is yet deficient 
in some of the most ordinary ivorks of consultation 
and of reference. On the other hand, the Ratcliffe 
Library at Oxford is jiroverbially the richest, in all the 
splendid zoological publications we are about to enume- 
rate, of any in Ilritain. Its late lamented librarian, Ur. 
Williams, was more especially distinguished for his zeal 
and liberality in this respect, and to him the library is 
mainly indebted for the celebrity it has acquired in this 
second number, and we have been unsuccessful in procuring their exact 
titles'. 
