May i8, 1905] 



NA TURE 



UNIVERSITY COLLEGE OF NORTH 

 WALES, BANGOR. 



<A Constituent College oi the Unhersity ok Wales.) 



Applications are invited for the post of ASSISTANT LECTURER IN 

 THE DAY TRAINING DEPARTMENT now vacant. Special sub- 

 jects : Elementary Science, Blackboard Drawing. Salary, Ciio. 



Applications and testimonials should be received not later than Monday, 

 June 12, by the undersigned, from whom further particulars may be 

 obtained. 



JOHN EDWARD LLOYD, M.A., 



May 5, 1305. Secretary and Registrar. 



ARMSTRONG COLLEGE, 



NEWCASTLE-UPON-TVNE. 

 ENGINEERING DEPAR T|M E N T. 

 The Council invites applications for the post of DEMONSTRATOR in 

 MECHANICAL ENGINEERING. Duties to begin on October t, 1905. 

 Stipend commencing at ^^150 per annum. Apply, with one set of testi- 

 monials, on or before June 8, 1905, to the undersigned, from whom full 

 particulars may be obtained. 



F. H. PRUEN, Secretary. 



ARMSTRONG COLLEGE, 



NEWC.'VSTLE-UPON-TVNE. 



DAY TRAINING DEPARTMENT. 



The Council invites applications for the post of MISTRESS of 



ME rHOD and LECTURER 

 at /liso per annum. Applicatioi 

 sent to the undersigned not latei 

 titulars may be obtained. 



1 EDUCATION. Stipend . 

 s, with one set of testimonials, must be 

 than June 8, 1905, from whom full par. 



F. H. PRUEN, Secretary. 



THE GLASGOW AND WEST OF 

 SCOTLAND TECHNICAL COLLEGE. 



The Governors invite applications tor a LECTURESHIP in CIVIL 

 ENGINEERING which it is proposed 10 establish. 



The salary attached to the post is .£250 per annum, and the lecturer must 

 be prepared to give his whole time to the College. 



Applications and testimonials must be sent not later than May 31 to lbs 

 Secretary, 38 Bath Street. Glasgow. 



The " N " Fellowship, tenable at Cambridge 



and open to former science students of Newnham and Girton Colleges, 

 will be vacant in the autumn. The holder is required to conduct 

 original research in science during her tenure of the fellowship, with 

 preference to the chemical physiology of animals and plants. Appli- 

 cations must be sent in by June 8 to the Princip.^l of Neu.vham 

 College, from whom further particulars may be obtained. 



FOR UISPOSAL, an Exceptional Bargain, 



ROS.S BINOCULAR MICROSCOPE with Mechanical St.ige and 

 Sub-stage, 3 Eyepieces ; \" , i", 2" and 4" Objectives, Condensing 

 Lens ; Polariscope ; Camera Lucida and many accessories. Cost over 

 .£50. Condition as new. For disposal owing to death of owner. 

 Lowest price ;^2o to an immediate purchaser. No dealers. — For further 

 particulars address " F. C. S.,"c/o Fletcher, Fletcher& Co., Holloway, 

 London, N. 



Metallurgical Laboratory, well equipped for 



experimental work, to let at low rent. One minute from Station. 

 Fifteen minutes to City. Apply Marshall & Co., Campbell Works, 

 Stoke Newington, N. (close to Station, G.K.R.). Tel., 79 Dalston. 



i8-inch Apps-Newton Coil for sale, in perfect 



condition. No trace of oxidation on the vulcanite. G. BowRON, 

 57 Edgware Road, VV. 



TYPE-WRITING UNDERTAKEN BY 



HIGHLY EDUCATED WOMEN ACCUSTOMED TO SCIEN- 

 TIFIC MSS. (Classical Tripos, Intermediate Arts, Cambridge Higher 

 Local, thorough acquaintance with Modern Languages). Research, 

 Revision, Translation. Scale of charges on application. The Cam- 

 bridge Type-writing Agency, to Duke Street, Adelphi, W.C. 



ON^ sale:. 



Astronomical Telescope, with 4 in. clear aperture, altazimuth stand, 

 I day and 4 .astronomical eyepieces, price only £17; others cheaper.— 

 Microscopes, second-hand by Zeiss, with substage and Abbe condenser, 

 objectives and triple nosepiece, for £9. Another by 



-ith I 





al stage, substage-conde 



& 



'oil 



and Iris-daphragn 



JS6 lOs. Another by Powell & I.ealand, with mechu,..^., o...^-, 

 substage-condenser, and seven objectives all " P and L," offered for £10. 

 Binocular Microscope by Swift, cost C*°, offered at £10. An- 

 other by S TEWARD, with mechanical stage, 2 oHjectives, double nosepiece. 

 &c.,£6. Assay Balance by Okrtlinc. 6 in. beam, double columns, 

 sensitive to ,1,, milligram, double rider, ccst l-z^. offered at £6. Others 



in Stock. 20 ft. Hydrogen Cylinder (ch.arge'd), price £1. Scientific 

 Lantern Slides on every subject at 5d. each. Microscope Slides on 



approval at 4d. each. 



Rev. H. MILLS, Greenside, Kendal. 



PLATYSGOPIG LENS. 



Ensraied Real Size 



AN ACHROMATIC COMBINATION. 



Combining the Definition of a Microscope with the 

 For ['ABILITY OF A Pocket Lens. 



( "If you carry a small Platyscopic Pocket Lens (which every 

 fir^p— J observer of Nature ought to do)." — Grant Allen, in Knowledge. 

 s^ I "I have long carried one of these instruments and found it 

 Unvaluable."-JoHN T. Carrington, Editorof Science Gossip. 

 The Platyscopic Lens is invaluable to botanists, mineralogisis, 

 or entomologists, as it focuses about three times as far from the 

 object as the Coddington Lens, and has a field unequalled for 

 flatness, allowing opaque objects to be examined easily. 



It is made in four degrees of power, magnifying respectively 

 10, 15, 20, and 30 diams. ; the lowest power, having the largest 

 field, is the best adapted for general use. 



Mounted in Tortoiseshelly viagnifying 10, 15, 20, or 30 s. d. 

 diameters, either power ... ... ... ... .. 15 



In Nickelised German Silver, eithei power ... ... 17 6 



Combinations of any two powers, in Tortoiseshell ... 27 6 



Ditto Ditto in Nickelised German Silver ... 32 6 



ILLUSTRAT ED DESCRIPTIO N SENT FREE. 



JOHN BROVSTNING, 



MANUFACTURING OPTICIAN, 



78 STRAND, LONDON, W.C. 



DO YOU WISH 

 >, TO BE 



BEWARE OF 



FEEBLE 

 IMITATIONS 



UP TO DATE 



n Scientific Demonstrating ? 



1:1, ^e^d for our full descriptive p-imphlet of 



the Kershaw- Patenr Lantern 



(St.oud and RendalFs and 



Kershaw Patent-), mide of 



best seasoned mahogany, 



French polished, lined with 



asbestos and Russian iron. 



■ ) double 



ctives, 90' 



complete 



xed jet, in 



measuring 



ALL ACCESSORIES SUPPLIED. ARC LAMPS, RESISTANCES, 

 STANDS, &c. 



mI^k^r a. KERSHAW, Dorring-ton St., Leeds. 



CONTR-iCTOK TO H..ir.-s CO rEK.Y.MEXT. 



R^£i,x>e Cliemica,ls, 



R.£L]:>e IVIetEils, 



For Laboratory, Scientific, and all other 

 purposes. 



RADIUM SALTS & RADIO-ACTIVE PREPARATIONS. 

 CALCIUM METAL, 1/6 oz. ; 20/- lb, 



Price List on Application. 



HARRINGTON BROS., 



Chemical Manufacturers and Dealers, 



4 OLIVER'S YARD, CITY ROAD, 



LONDON, E.G. 



