v o> •y . 



Ionian Inst/ 



A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE 



11 To the solid ground 

 Uf Nature trusts the mind which builds for aye." — Wordsworth. 



JUN24 



No. 2276, Vol. 91] 



THURSDAY, JUNE 12, 1913 



[Price Sixpence 



Newspaper at the General Post Office. 1 



[All Rights Reserved. 



84/- 



:o.nplete. 

 Garden Stand, 5 - 



REGIS II- RED 



VITA8C0PE. 



An entirely novel Instrument 

 for examining and observing 

 living insects in the garden or 

 the house under high magnifi- 

 cation without disturbing them 

 or removing them from their 

 -■-y natural surroundings. 

 The magnification 

 can be varied from 

 12 to 60 diameters. 



SDLK 3IAKKRS- 



NEWTON «& CO., 

 72 WIGMORE ST., LONDON W. 



BECK'S FOCOSTAT LENS 



(HISCOTTS PATENT). 



REYNOLDS & BRANSON, Ltd. 



GRAND PRIX AWARD. TURIN. 



SOLE AUTHORISED MAKERS OF 



STROUD & RENDELL SCIENCE LANTERNS. 



The " University " Lan- 

 tern, with Russian iron 

 body, sliding baseboard, two 

 superior objectives, plane 

 silvered mirror "A," which 

 is moved by a knob causing 

 the rays to be reflected 

 upwards for the projection of 

 objects in a horizontal plane, 



1 silvered back which can 

 used at " C," or as an 

 ng prism in mount " D," 

 light burner, slide carrier. 

 : complete in tiavelling 

 without reversible adjust- 

 able table "B," £10 7 6 

 ... 11 15 

 extra 7 6 



ith "Pha 





Ditto, ditto. 



Reversible adjustable table " B" for supporting apparat 



The " College " Lantern, without adjustable table, with 



lime-light burner complete .. 8 2 6 



Ditto, ditto, with " Phcenix " arc lamp ... 9 10 



Slit and prism for spectrum with support, for either lantern ... 1 7 6 



Polariser and analyser 2 



Catalogues post free. 



Optical Lanterns and Accessory Apparatus. 223 pages. 



Abridged List of Chemical Apparatus and Chemicals, 44 pages. 



Mechanical Models for teaching Building and Machine 



Construction. 



14 COMMERCIAL STREET, LEEDS. 



R. & J. BECK, Ltd., 68 CORNMLL, LONDON, EX. 



Negretti & Zambra's Traveller's 

 Companion — Aneroid, Compass, 

 and Thermometer, in case — is a 

 useful and acceptable present. 



Price list 0/ 

 " Barometers " 

 sent free on 

 request. 



NEGRETTI & ZAMBRA 



Scientific Instrument Makers, 

 Holborn Viaduct, London, E.C. 

 City Branch : 45 Comhill, E.C. 

 West End : 122 Regent St., W. 



