10 
OPTICAL AND MECHANICAL 
REPAIRS 
Repairs to any make of microscopical apparatus undertaken and carried out 
efficiently in our own workshops by thoroughly experienced mechanicians. 
We also specialise in Microtomes, Photo-micrographic apparatus, Optical 
Projection and Drawing apparatus, Blood Counting Instruments, Polarizing 
Microscopes, Dissecting Microscopes, Microscopes for binocular vision for 
all magnifications, Stereoscopic binocular microscopes for low magnifica- 
tions, Corneal binocular microscopes and other instruments for examination 
of the eyes, Lamps for microscope illumination and Electric Arc lamps of 
unique design and possessing valuable features. 
As the British Agents for the celebrated firm, Messrs. Leitz of Wetz- 
lar, we are in a position to execute orders for Leitz manufactures promptly 
from stock. 
We also undertake to supply any reputable make of instruments or appa- 
ratus, and are also prepared to offer advice upon the selection of any of above- 
mentioned apparatus required for specific purposes. 
OGILVY 81 COMPANY, Scientific Instrument Makers, 
18 BLOOMSBURY SQUARE, LONDON, W.C.l 
Ltd. Est 
STEVENS’S AUCTION ROOMS, I76o 
A SALE by AUCTION is held EVERY FRIDAY, at 12.30, which affords first-class 
opportunities for the disposal or purchase of Scientific and Electrical Apparatus, Micro- 
scopes and Accessories, Surveying Instruments, Photographic Cameras and 
Lenses, and Miscellaneous Property. 
Catalogues and terms for selling will be forwarded on application to STEVENS’S 
AUCTION ROOMS, Ltd., 38 King Street, Covent Garden, London, W.C.2. 
SCIENTIFIC APPLIANCES /' 1 n “ t 1 erials Electrical, Magnetic, & Experimental Work 
We do not specialize in Microscopical parts or apparatus ; but every Scientific Microscopist 
requires varied Lenses, Prisms, Electric Lamps, Insulated Wires, Ebonite, Metals in 
Tube, Sheet or Rod, Screws, Cabinet Work, Insulating Materials, Batteries, Coils, 
etc. etc. We have the experience of 50 years. Write us or call, and you will find a store for 
all Scientific Work. New List, 6 d., post free. Second-hand and Supplements to list 2 stamps. 
SCIENTIFIC APPLIANCES (Dale & Hollins), ii & 29 Sicilian Avenue, London, W.C. 1 
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. 
LARGE STOCKS OF BOOKS IN ALL BRANCHES OF MICROSCOPY. Quotations on application. 
Libraries or small parcels purchased. 
WAMTED QUARTERLY JOURNAL microscopical science. 
2, 3 and 4 ARTHUR STREET, NEW OXFORD STREET, W.C.2 
Telephone : Gerrard 1412. 
