6 
Wratten Specialties 
for Microscopy 
Wratten “M” Filters and Wratten “M” Plates give the 
maximum amount of detail and the maximum amount 
of contrast when photographing stained specimens. 
Wratten Visual “M” Filters as their name 
implies, are for visual work with the microscope. 
35m.m. in diameter for Standard Substage Ring. 
Special Filters for Special Work. 
“Notes on the use of Wratten 
* M ’ Filters ” 3d. post free. 
Kodak Ltd., Wratten Div., Kingsway, London, W.C. 2. 
FINE SECOND-HAND 
MICROSCOPES 
By all the leading makers, Zeiss, Leitz, Watsons, etc. 
FOR SALE and WAITED FOR CASH 
As we work on a very small margin of profit we can usually offer 
special fine instruments at very low prices. All accessories. We 
have at present a small parcel of magnificent 1/12" oil immer- 
sion objectives at £3-17-6 each. 
AH New Models supplied at 
lowest list prices 
Deferred Payments. Exchange. Best Value. 
WALLACE HEATON, L™ 
119 New Bond Street, London, W.1 
