Advertisements. 



MICROSCOPICAL REAGENTS 



Specially Pure for Bacteriological Work. 



Dry Stains; Staining Solutions; Hardening, Fixing and Clearing Reagents; 

 Mounting Media ; and Cedar Wood Oil for Oil Immersion Lenses 



ANALYTICAL REAGENTS 



Volumetric Solutions, Test Solutions, Test Papers. 



INDICATORS FOR BIOCHEMICAL RESEARCH 



Sorensen Solutions, Buffer Solutions. 



THE BRITISH DRUG HOUSES Ltd. 



Makers of Fine Chemicals, 



Graham St., City Rd., London, N.l. 



Chemical Works: Wharf Road, London, N.I. 



H. K. LEWIS & CO. LTD. 



Scientific and Technical Booksellers. 



Complete Stock of Text Books and Recent Literature 

 in all Branches of Agricultural and General Science. 



LARGE STOCK OF SECOND - HAND BOOKS ALWAYS AVAILABLE. 



Extension, 140, GOWER STREET, now open 



Orders by post or le'ephone promplly attended to. Telephone : Museum 4031. 



MEDICAL AND SCIENTIFIC 



CIRCULATING LIBRARY. 



Warren Street Station (Five minutes) I Close to Euston Square Station 



All Tube Railways. I (Metropolitan Railway). 



Annual Subscription, Town or Country, from One Guinea. 

 The Library Reading and Writing Room (1st Loot) is open daily. 



Catalogue of Library, with Supplement (1918-20), with Authors and 

 Subjects Index, 558 pp., demy 8vo., 12 6 net (to Subscribers, 6/- net). 



Telegrams: " Publicaoil, Eusroad, London." Telephone: Museum 1072. 



136, GOWER ST. & 24, GOWER PLACE, LONDON, W.C.I. 



(2758 — a) > 



