IV .r/.!0?iS'i PREFACE. 



varies much in composition and amount. In the " Scientific 

 Index" to the List of Animals in the Society's Gardens, 

 published in 1844 (which is, I believe, the last classified 

 list issued), the number of species exhibited is given as 

 335 namely 134 Mammals, 197 Birds, 3 Reptiles, and 

 1 Fish. This shows that we have made considerable progress 

 since that period. 



I may add, that I am solely responsible for the arrange- 

 ment and scientific nomenclature of this list and for the 

 correct determination of the species. The difficulty, I may 

 almost say the impossibility, in many cases, of ascertaining 

 the specific names of living animals with perfect accuracy, is 

 too well known to render apologies necessary in several cases 

 where I may have failed in effecting this object. 



PHILIP LUTLEY SCLATER, 



Secretary to the Zoological Society of London. 



II Hanover Square, 

 June 2nd, 1862. 



