VIII. 



KNOWLEDGE. 



June, 1915. 



Bauscli"'|omb 



New Combined Drawing and Photomicrographic Apparatus. 



Most complete instrument for low or high power photomicrography 



in horizontal or vertical position. The attachment for drawing is most 



conveniently placed, and can be raised or lowered to suit the con- 

 venience of the operator. 



The apparatus can be used with the microscope either horizontally 

 or vertically, and serves simultaneously as a projection outfit for lantern 

 slides or micro-projection of transparent or opaque objects. 



Dark-ground illumination is also rendered to the greatest perfection, 

 so that this instrument can justly claim to be universal, and appUcable 

 for research work of any kind. 



Price, complete, exclusive of microscope — 



£32 : 6 : 



Demonstration of this Instrument will gladly be given In our 

 New Demonstration Rooms by appointment. 



Please vvpite for particulars (Catalogue " C.a.2 ") post free. 



Alsu purtkiilar.s nl MICROSCOPES (over 1 0O.OOO sold). MICROTOMES, 



PROJECTION APPARATUS, CENTRIFUGES. GANONG'S APPARATUS 



for PLANT PHYSIOLOGY. VISCOSIMETERS, &c., on appllcutiun. 



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. 



BAUSCH & LOMB OPTICAL CO., 

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



O/; l/fKOVCH ALL PEAl.EKS. 



JAMES SWIFT & SON, 



OPTICAL AND SCIENTIFIC INSTRUMENT MAKERS. 



Ci^'itracto's /,» al! Scienti/u Pr/^arfineuts n/ I/.M. Gorf. 



Grands Prix, Diplomas of Honour, and GoIJ Medals at 

 London, Paris, Brussels, &c. 



"PREMIER" MICROSCOPE 



This stand Is pre-eminent before all others 

 fur pertection of design, finish and adjust- 

 ment. It Is without equal both lor advanced 

 visual research and tor photo-micrography, 



Vm' "XATURi:" savs : "One of Ou most 



perfect stands we have seen" 



(Se^ isstn: of A'ou. \3th. 1913. p^gi 329.) 



N3. — All oar Microscopes (including 

 the Lenses) are made in our own 

 workshops on the Premises. 



■ k'rali. t 



I rr^ne-t. 



UNIVERSITY OPTICAL WORKS 



81 Tottenham Court Road, London. 



BOTANICAL COLLECTING CASES 



Inland Postiige. 

 3'- ... 4d. ' 



3,9 ... 5d. 



4/9 ... bJ. 

 5/9 ... 6./. 

 10/6 ..• 8d. 



Pocket sizes, 1/9 and 

 2/3. 



{Postage 3d.) 



Shoulder Straps, 1/2. 



For theaboveandother 



Collectinj; Apparatus, 



see Catalogue C/13 



post free. 



FLATTERS & GARNETT, Ltd., 



309. OXFORD ROAD C^fi!;?;!^:;;:'). MANCHESTER. 



How much Rain has fallen? 



RAIN GAUGES. 



STANDARD "SNOWDON" 



GAUGE, with strong cupper 

 body, extra heavy brass rim, 

 inside gl.ass receiver, and best 

 engine-divi(!ed "Camden" 

 Inch or Metric Measure, and 

 instructions for fixinsr. 



/- 



Rain Gauges of 



ALL PATTERNS 



supplied from Stock. 



ALSO 

 SELF-REGISTERING 

 and SELF-RECORDING. 



PASTORELLI & RAPKIN, Ltd. (v;#o^) 



ACTUAL MAKERS OF ALL KINDS OF METEOROLOGICAL INSTRUMENTS 



(With Kew Certificates, if i!c--i 



•d). 



Contractors to M.M. Government. 



46, HATTON GARDEN, LONDON, E.G. 



STANDARD INSTRUMENTS OF ALL KINDS. 

 IV Illustrated Price LUt.s Post Free. 



*,* We pay carriage anj guarantee safe delivery within U.K. on all our [n.strumerUs. 



Printed far the Proprietors (Knowledge Pubhshing Company, Limited), by JOHN King, Ealing and Uxbridge.— June, 1915. 



