SCIENTIFIC BOOKS 
H. K. LEWIS & CO. Ltd. 
A very large selection 
of new and standard works 
in every branch of Science 
always available. 
The Department for Scientific 
Books, English and Foreign, is on 
the first floor. 
Orders and Inquiries by Post 
promptly attended to. 
Underground: Euston Square, Warren 
Corner of Gower Street and Gower Street. Buses: Euston Road and 
Place adjoining University College. Tottenham Court Road. 
SCIENTIFIC CIRCULATING LIBRARY 
Annual Subscription, Town or Country, from One Guinea. 
Books may be retained as long as required or exchanged daily. 
The LIBRARY is useful to SOCIETIES and INSTITUTIONS, and 
to those engaged on SPECIAL RESEARCH WORK, ETC. The 
Library includes all Recent and Standard Works in all branches of 
Medical and General Science. Every work is the latest edition. 
Full Prospectus on Application. 
READING AND WRITING ROOM (First Floor) open daily. 
NEW BOOKS AND NEW EDITIONS are added to the Library and 
are available to Subscribers IMMEDIATELY ON PUBLICATION. 
CATALOGUE OF THE LIBRARY, revised to December, 1927, with 
Supplement, 1928-30, containing Classified Index of Subjects and 
Authors, demy 8vo, 16s. net (to Subscribers, 8s.). The Supplement 
separately, 2s. net (to Subscribers, 1s.). 
BI-MONTHLY LIST OF NEW BOOKS AND NEW EDITIONS 
is issued free to all Subscribers and Bookbuyers regularly. 
H. K. LEWIS & CO. Ltd. 
PUBLISHERS AND BOOKSELLERS 
STATIONERY DEPARTMENT: Sctentific and General. Loose-leaf 
Note Books, Record Cards, Filing Cabinets, etc. 
SECOND-HAND BOOKS: 140 Gower Street. Large and varied stock. 
Books wanted advertised for and reported. (Telephone: Museum 4031) 
136 GOWER STREET, LONDON, W.C.1 
Telegrams : ‘ PUBLICAVIT, EUSROAD, LONDON.’ Telephone: MUSEUM 7756 (3 dines). 
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