KNOWLEDGE. 



January, 1915. 



I>ROF. GJLNONG'S 



APPARATUS FOR PLANT PHYSIOLOGY. 



Manufactured by us under his directions. 



Adopted by many Advanced Workers, Including Government 

 and Forestry Departments, Botanical & Agricultural Colleges, 

 etc., throughout the World. 



The LATEST CATALOGUE includes 10 new and 

 important pieces of apparatiis, making 26 in 

 ail. if you have not already received it, please 

 write for Catalogue " P D V 2." 



Also particulars of MICROSCOPES (over 100,000 sold), MICROTOMES, 



PHOTOMICROGRAPHIC and DRAWING APPARATUS, PROJECTION 



APPARATUS, CENTRIFUGES, VISCOSI METERS, &c., 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 liave just received larf^e stocks. 



Bausc(i"'|omI» 



OPTICAL COMPANY, 



37-38, Hatton Garden, London, e.g. 



OR THROUGH ALL DEALERS. 



Trade Mark. 



JAIVIES S^WIFT <& SON, 



OPTICAL AND SCIENTIFIC INSTRUMENT MAKERS. 



Contractors to all Scientific Departments of H.M. Government. 



Grands Prix, Diplomas of Honour, and Gold Medals 

 at London, Paris, Brussels, &c. 



NEW (C 



MODEL 



RESEARCH ' MICROSCOPE 



SPECIALLY DESIGNED FOR BACTERIOLOGY AND 



ANALYTICAL WORK. 

 With Improved Fine Adjustment and Special 



Mechanical Stage*. 



Fitted with §-in., J -in,, and ^.y^n.. (Oil Immersion) 



Objectives, Oculars, Triple Dustproof Nosepiece, Abbe 



Condenser, Iris Diaphragm, etc., in Cabinet, £21 • 



N3. — All onr Microscopes (including 

 the Leases) axe made in oui own 

 workshops on the Premises. 



Catalogue Post Free. 

 UNIVERSITY OPTICAL WORKS, 81, Tottenham Court Road, LONDON, W. 



Microscopes and Accessories, 



All interested in microscopical worh should ask 

 for a copy of our 



NEW CATALOGUE "6/14," 144 pp., .S. 



It contains particulars of all hinds of Mounting 



Requisites, Dissecting Instruments, Stains, 



Chemicals, and Glassware. It is one of the 



most comprehensive Catalogues issued. 



FLATTERS & GARNETT, Ltd., 



309, OXFORD ROAD ("^Sti.^'O. MANCHESTER. 



THE "FORTINETTE" 



STANDARD BAROMETER. 



gSjli 



1 



(Each Barometer is marked " Fortinette.") 



Registered Design No. 420,297. 

 Designed to meet the requirements of Students and 

 others who find the need of a Barometer which will give 

 exact readings, and cost but a moderate sum. 



^ Used for demonstration purposes in all the 

 principal Science and Technical Colle£:es, and 

 adopted by the L.C.C. for use in their Classes. 



N.B, — We wish to emphasize that this 

 is a STANDARD BAROMETER, made 

 on the SAME principle as the larger 

 Portia's Barometer, and gives readings 

 to '01 inch and */ millimetre. 



We confidently recommend this Instrument for use as 

 a " Standard " in Colleges and Schools, private Observa- 

 tories, and by Gas and other Engineers. 

 Price, complete, mounted as illustrated, 



£3 7 6 net. 



Na^. Phys. Lab. Certificate, if desired, los. od. extra. 



GLAZED CASE (Oak or Mahogany) with lock, to 



contain above Barometer, £1 io O net. 



NATURE says:— *' Provides an accurate 

 instrument at a moderate cost'* 



DESCRIPTIVE CIRCULAR POST FREE. 

 Sole Manufacturers and Proprietors of the Regd. Design: 



PASTORELLI & RAPKIN. Ltd. (^«;*f ). 



46, HATTON GARDEN. LONDON, E.C. 



ACTUAL MAKERS OF ALL KIKDS OF METEOROLOCICAl INSTRUMENTS 



Contractors to H.I\I. Govcnimcnt. 



vm- ILLUSTRATED PRICE LISTS POST FREE. 



**» We pay carnage 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. — January, 1915. 



