PEEFACE. 



The |3resent General Index of Generic and Specific names 

 is arranged precisely like its predecessor for 1859-1876, 

 published in 1879, and, like it, covers eighteen volumes of 

 'The Ibis,' commencing with the first volume of the Fourth 

 Series, 1877, and ending with the last of the Sixth Series, 

 1894. 



The laborious task of transcribing the eighteen Indexes 

 and the rearrangement of the names in alphabetical order 

 has been carefully performed by Mr. G. A. Doubleday, 

 formerly Assistant Librarian, now Publication Clerk to the 

 Zoological Society of London. The method adopted was 

 the same as that employed for the last General Index and 

 described in the preface to that volume. My task has been 

 to supervise the whole work in its course through the 

 jjrcss. 



This Index exceeds the last (1859-1876) by 39 pages, 

 the excess containing about 1300 names. The difference 

 is no doubt to some extent due to the greater aggregate bulk 

 of the last eighteen volumes over that of the first eighteen. 

 The first three Series, exclusive of Index and other matter, 

 contain altogether 8541 pages, or an average of nearly 475 

 pages each volume ; the next three Series contain a total of 

 10688 pages, each volume averaging about 593 pages. But 

 comparing this difference in the number of pages with that 



