PHOTOGRAPHIC MATERIALS FOR 

 SCIENTIFIC WORK 



WRATTEN & WAINRIGHT, Ltd., manufacture photo- 

 graphic Dry Plates and Colour Filters for all purposes. 



Ordinary Plates, renowned for the past 35 years ; 

 Colour Sensitive Plates, including the famous 

 "Wratten Panchromatic," the most colour sensitive 

 plate in the world ; Lantern Plates, on which it is 

 easy to obtain a variety of tones ; Process Plates, 

 X-Ray Plates, Special Plates for Microscopy, 

 Spectroscopy, and other scientific purposes ; Colour 

 Filters for use as Orthocromatic Screens, Contrast 

 and Compensating Screens ; Tricolour Filters ; Filters 

 for Safelights, and every purpose for which filters 

 are required. 

 Send for our Latest Descriptive Price List for explanatory account of our 

 manufactures 



WRATTEN AND WAINWRIGHT, LTD 



CROYDON, ENGLAND 



OLDEST ESTABLISHED DRY PLATE MAKERS IN THE WORLD 



MARINE 



BIOLOGICAL ASSOCIATION OF 



THE UNITED KINGDOM 



Dredges, trawls, plankton-nets, and other collecting apparatus supplied ; 



also living and preserved specimens of marine animals and plants for 



research, museum, and teaching work. 



For Prices and other particulars, as well as for Terms of 

 Membership of the Association, apply to 



THE DIRECTOR, The Laboratory, CITADEL HILL 

 PLYMOUTH 



