KNOWLEDGE. 



May, 1915. 



NEW MODEL 



FS and FFS 



fyauscir|oml> 



MICROSCOPE 



WITH SAFETY SIDE FINE ADJUSTMENT. 



NEW ATTACHABLE MECHANICAL STAGE, No. 2116, £3 5 



We have sold over 100,000 Microscopes, which are in use all over the world. 



Inspection invited at our New Showrooms, or List "A. 5. 2" sent post free. 



N.B.— ALU 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., 37-38 Hatton Garden, London, E.C.sr, 



through 

 Dealers. 



JAMES SWIFT & SON, 



OPTICAL AND SCIENTIFIC INSTRUMENT MAKERS. 



Contractors to all Scientific Departments «/ H.M. Government. 

 Grands Prix, Diplomas of Honour and 

 Oold Medals at London, Paris, Brussels, etc. 



APOGHROMATIG MICRO. OBJECTIVES. 



As we are in possession of a quantity of absolutely clear white Fluorite, we 

 are now manufacturing the following series of Apochromats : 



NATURE says: "Compare very favourably in all respects with 

 similar lenses of other makers at double the price." 



Catalogue gratis on application. 

 UNIVERSITY OPTICAL WORKS, 



81, TOTTENHAM COURT ROAD, LONDON. 



BOTANIGAL COLLECTING CASES 



3/- 

 3/9 

 4/9 

 5/9 

 10/6 



'nland Postage. 

 ... Ad. 



5d. 



bd. 



bd. 

 ... Sd. 



Pocket 



sizes, 1/9 

 2/3. 

 (Postage 3d.) 



and 



Shoulder Straps, 1/2. 



For the above and other 



Collecting Apparatus, 



see Catalogue C 13 



post free. 



GARNETT, Ltd., 



Opposite the 

 "versity 



MANCHESTER. 



FORMS A MOST INTERESTING AND LASTING GIFT. 



THE "SIMPLEX" BAROGRAPH. 



(REGISTERED No. 468791.) 





In Oak Case, glazed top and sides. Records on a Weekly Chart. OQ -i ft C 



Price, with a year's supply of Charts, Ink and Instructions, complete dbll 10 D 



W Special Illustrated List of Barographs and Thermographs 



(covering various patterns, from £3 15s,), post free. 



SOZ.fi MAKERS: 



PASTORELLI & RAPKIN, Ltd. 



(ESTABLISHED 1730), 



ACTUAL MAKERS OF ALL KINDS OF METEOROLOGICAL INSTRUMENTS, 



Contractors to H.M. Government, 



46, Hatton Garden, London, E.C. 



STANDARD INSTRUMENTS OF ALL KINDS. 



Illustrated Price Lists Post Free. 



*»* 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.— May, 1915. 



