Wrattee Specialties 
for Microscopy 
Wratten “M” Filters and Wratten “M 99 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. 
THE 
BINOCULAR EYEPIECE 
STAND A. & B. 
SKIN MICROSCOPE 
I 
NEW 
MODELS 
I 
IMPROVED PARABOLOID 
CONDENSER FOR SLIDES 
OF VARIED THICKNESSES 
Distributors : 
J. W. ATHA & CO. 
8 Southampton Row, W.C.l 
Gurr’s Neutral Mounting Medium 
Has been subjected to severe tests, and results prove that it 
will not fade Giemsa, Leishman and other stains which usually 
fade when mounted in Canada Balsam. 
Should be used in all cases where preservation of the stain 
is important. 
PRICE LIST OF STANDARDISED STAINS ON APPLICATION 
; 
Prepared only by 
GEORGE T. GURR 
35 Perrymead Street, Fulham, London, S.W.6 
