4 
MICROSCOPES and APPARATUS 
NEW and SECOND-HAND 
ADAPTATIONS and REPAIRS 
A SPECIALITY 
HAWKSLEY & SONS 
83 WIGMORE ST., LONDON, W. 1 
AGENTS 
FOR 
THE SPENCER LENS CO. 
BUFFALO, NEW YORK, U.S.A. 
MICROTOMES and PROJECTION APPARATUS 
BY 
The SPENCER LENS CO. 
BUFFALO, NEW YORK, U.S.A. 
Agents: HAWKSLEY & SONS, 83 WIGMORE STREET, LONDON, W.i 
SCIENTIFIC PERIODICALS AND BOOKS I 
Messrs. W. HEFFER &. SONS, LTD., Booksellers, Cambridge, 
will be glad to receive offers of Complete Libraries, Sets of Journals, and 
Smaller Collections of Books, for which they are prepared to offer full market 
price and pay cash. 
They will also be glad to have enquiries for both new and second-hand 
books, English and Foreign, of which they carry an immense stock. 
They have a Special Department for transactions with Libraries and Institutions. 
Now Ready. Catalogue 210, including a section on Microscopy. 
Post free on application. 
Xtceitseb Valuers tor probate. 
Telegrams and Cables : Heffer, Cambridge. Telephone : 802 {2 lines). 
