KNOWLEDGE. 



April, 1915. 



FOR 



Zoology & Botany Classes & Forestry Work. 



Adopted by Agricultural!} and other Colleges 

 under various Government Departments. 



[Jauscfi [omf> 



DISSECTING MICROSCOPE. 



The best Instrument of its kind. 



Has hinged base provided with suitable receptacles for imuj 

 instruments used in the work. 



and dissecting 



Complete with two Coddlngton 

 lenses, 38mm. and 19mm., 



Inland parcel post, Cd. ^^^_^_^_ - ______ 



ITS. 6d. 



Foreign, Is. Ctl. 



MICROSCOPES FOR AIL REQUIREMENTS UP TO THE MOSTADVANCED RESEARCH. 



OVER 100,000 SOLD, WHICH ARE IN USE THROUGHOUT THE WORLD. 



Call and Inspect at our New Showrooms, or ask for List "A 2" (Microscopes) post free. 



Also particulars of MICROTOMES, PHOTO-MICROGRAPHIC and DRAWING APPARATUS, PROJECTION APPARATUS, 

 CENTRIFUGES, GANONG'S APPARATUS lor PLANT PHYSIOLOGY, VISCOSIMETEUS, Sc, on application. 



N.B.— ALL OUR INSTRUMENTS BEING MADE AT OUR OWN 

 FACTORY IN ROCHESTER, N.Y., THERE WILL BE NO DELAY IN 

 DELIVERY, AND WE HAVE JUST RECEIVED LARGE STOCKS. 



Trade Mark. 



BAUSCH & LOMB OPTICAL CO. 



Contractors to British and Foreign Governments, 



37-38, HATTON GARDEN, LONDON, E.G. 



[Telephone: Holborn 2640.] OR THROUGH ALL DEALERS. [Telegrams: "Optibalof, London: 



Trade Ma 



Dr. A. HUTCHINSON'S 

 NEW 



UNIVERSAL GONIOMETER 



For the Examination 0! Small Crystals and 

 Mineral Grains. 



This instrument can be used lor any of the following purposes : — 

 As an Ordinary Goniometer for the Measurement of Angles. 

 As an Axial-angle Apparatus. 

 As a Kohlrausch Tolal-rerlectometer. 



For Determining Refractive Indices by the Prism Method. 

 For Experimental U'oik in Mineralogy. 



Descriptive PatrplUct on Application. 



JAMES SWIFT & SON, 



UNIVERSITY OPTICAL WORKS, 



81, TOTTENHAM COURT ROAD, LONDON. 



Pastorelu & Rapkin, 



(Estab. 1750.) Ltd. 



46, HATTON GARDEN, 



LONDON E.C. 



GLASS-TOP BOXES, 



BOTH CARD &. WOOD, FOR COLLECTORS. MUSEUMS. &c, 

 for STORING SHELLS. EGGS, COINS OR OTHER OBJECTS. 



In all sizes, 



both pound 



and 



rectangular. 



FLATTERS & GARNETT, Ltd., 



MAKERS OF LANTERN AND MICROSCOPE SLIDES, 



309, OXFORD ROAD (%££'). MANCHESTER. 



ACTUAL MANUFACTURERS of all kinds 

 of Meteorological Instruments. 



STANDARD 



INSTRUMENTS. 



(With Kern Certificates, if dr. 



id.) 



Fort in's Barometers. 



Maximum Thermometers. 



Minimum Thermometers. 



Hygrometers. 



Earth Thermometers. 



Sunshine Recorders. 



Rain Gauges. 



Anemometers. 



Self-registering Rain Gauges. 



, Barometers. 



_ .. Thermometers. 



Self-recording Rajn Gauges 



1 Anemometers. 



Etc. 



Illustrated Price List Post Free. 



ContractOPS to H.M. Government. 



Telephone: 1981 Holborn. Telegrams: Rapkin, London. 



\* We pay carriage and guarantee safe delivery 

 within U.K. on all our Instruments. 



Printed for the Proprietors (Knowledge Publishing Company, Limited), by John King, Ealing and Uxbridge. — April, 1915. 



