BRITISH MUSEUM (NATURAL HISTORY). 95 



There are now, on a rough estimate, 106,945 volumes (exclu- 

 sive of continuations and minor separata) and 6,339 maps in the 

 whole building. 



The number of visits paid to the General Library during the 

 year by Students and others (irrespective of the Staff and persons 

 to whom the use of a key is granted) was 1,585. 



Donations have been received from a great number of 

 Museums, Academies and other corporate bodies, as well as from 

 personal donors. 



The printing of the Supplement to the Library Catalogue has 

 been continued, title-slips to the middle of " GUEIN' " have been 

 set up in type, and printed off as far as " GEEG," and the first 

 four sheets of the *' Addenda and Corrigenda" have also been 

 printed off. 



Index to the Genera and Species of Animals. 



During 1920 work has proceeded satisfactorily, and upwards 

 of 25,000 references have been added to- the manuscript. 



After thirty years' work every book referring to Zoology (pub- 

 lished before 1851) in the libraries of the British Museum 

 (Natural History), of the British Museum and all the scientific 

 societies of London, Oxford, Cambridge, Manchester, &c., have 

 been collated and indexed. There remain some 1,000 volumes of 

 serials yet to be dealt with, and about 150 volumes not in Eng- 

 land, which have been referred to by systematists. 



A. start has already been made towards the preparation for 

 press by lexicographically sorting the slips preparatory to editing, 

 and it is hoped that the "Introduction," "Bibliography," and 

 letter " A " will be ready for the printer by July, 1921. 



Valuable help has been afforded Mr. Sherborn by correspon- 

 dents, in Zurich, Berlin, Vienna, Dijon, Poictiers, New York, 

 Washington, &c., who not only carried out the work personally, 

 but also in such form as to be of permanent value to the libraries 

 under the charge of the Trustees.. 



Index Museum and MoRrnoLoaicAL Collections. 



All the dissections exhibited in the Index Museum have been 

 examined during the course of the year, and where necessary have 

 been cleaned, re-spirited or re-sealed. 



A new case has been placed on exhibition in tTie Hall, to 

 illustrate the connection between Tsetse-Flies and Sleeping Sick- 

 ness. It contains a greatly enlarged model (the work of Mr. 

 A. J. Engel Terzi) of the tsetse-fly, Glossina palpaUs, the chief 

 transmitter of this disease, together with actual specimens. En- 

 larged coloured drawings showing the fly in its characteristic 

 resting position, its attitude while sucking blood, and the arma.- 

 ture of the piercing proboscis as compared with other flies, are 

 also exhibited. The case further includes models of the infective 

 parasite Trypanosoma gamhiense, as well as drawings of Try- 

 panosomes from the saliva and gut of the transmitting tsetse-fly. 

 A series of photographs of " habitats " of Glossina palpalis, and 



