Messrs. DULAU & CO., Ltd. 



{for over a century at 37 Soho Square) 



34-36 Margaret Street, Cavendish Square, 



LONDON, W.l 



{close to Oxford Circus). 



A large and constantly changing Stock of 



NATURAL HISTORY BOOKS 



both New and Second-hand of Works on 



ENTOMOLOGY, ORNITHOLOGY, 

 GENERAL ZOOLOGY and BOTANY. 



Newly published Catalogue of Important Botanical and Zoological 

 Works, No. 95, sent post free on application. 



LIBRARIES PURCHASED, AT ANY DISTANCE. 



Telephone— MAYFAIR 3809. 



SCIENTIFIC BOOKS and SERIALS. 



WHELDON & WESLEY, Ltd., have the largest stock in the country of 



Books in all departments of Science and Natural History, also Transactions and 



Journals of Learned Societies, etc., in sets, runs, and single volumes or numbers. 



Libraries or Sma.II Parcels Purchased. 



SEPARATE CATALOGUES on all Subjects, 2d. each, post free. 



2, 3, & 4 ARTHUR STREET, NEW OXFORD STREET, LONDON, W.C. 2. 



Telephone: Gerhard 1412. 



All Communications for the Editoe should be addressed to 

 Dr. R. H. EASTALL, Christ's College, Cambridge. 



Books and Specimens to be addressed to the Editor as usual, care of 



MESSRS. DTILATJ & CO., LTD., 34-36 MARGARET STREET, 



CAVENDISH SQUARE, W. 1. 



Cloth Cases for Binding may be had, price 2s. 6d. net. 



STEPHEN AUSTIN AND SONS, LTD., PRINTERS, HERTFORD. 



