KNOWLEDGE & SCIENTIFIC NEWS. 



[January, 1907. 



POR SALE.— Typewriter — "Ford." 



* ]n good working order. Cosl ;f 14 i.(S. 

 A b.-irg.-iin. 7 guine.is or nearest ofler. To he 



seen ni A'« !.-/,-,/iYOmce, 2~, Chancery I.aric. 



FOR SALE. — Several llioiisands second- 

 luin.l MICR05C0PI- 5LII)BS l.v tli<- Hrsi 

 Mounlcrs. (./-do/oii. liol.inv, l.isicis.iiid l..lll^. 

 Anoloiny, Rock sictcoiis, lie. Also SI ID13 

 CABINIiT5 l>y lk-ck.iiij otlicrs. hol.liiiK fr.ii.i ;c>o 

 1?,-V.'i'.".-'"'"''?- '■"■slclass Heck Hiiiocular AIICKO- 

 TP?P«^n'u'J","''';.^''''^"""' f-"- Si '" ASTRO. 

 Ko<l. I all SlaiKl, iD 15s. Manv oiIhts, all kincls'aiul 

 !.'« u.xK £''»':''»on'» Second hand Optical Mart, 

 338, High Holborn, London ii.(.,.,i,<./, (;,„„■,, ;„„ /,■,/, 







N SALi; — Astponom'cal Tele- 

 scope li.v \\ liAV, IJ in. c-lrar np.rluic, 



iraille Miyiiorl, Irifoil, lliidrr, f32. AsoniKii. liy 

 Sol.osiox>, Si in., nmgnirlciMitly made IhroUKli- 

 out, two steadying lelosoopio rods to big end, one 

 nicking slindying rod to cjciiicoo. slow inot-oii 

 tripod. Kill respond to most rigid test, Xl'.l, 

 Chomical Balance, Agate bearings, j isi 

 onrliauled by Omiimno. load 100, sensitive 

 ,V niillifrnmnie. lost lie. prioo i,1 10s. Zeis'.' 

 Prismatic Binocular, sliiigcaso, f, 

 Chronometer by Aii.noi.i>, f-,. Transit 

 Instrument by TiioniUTON & Siu.ms, c!r,;iilar 

 stand 111 brass, adjus ing screws, striding level 

 .IT. lOi. Miner's Level, eomiilcle ,is new, cost 

 X2\. price XI. Portable Microscope in 

 ease, by H,;i 1,, xi. Society of Arts Micro- 

 scope, ei^mplelt in case, ,tl 10s. 

 JOHN LACKLAND, :i(l BJaokliiarj Street, .Salford, 

 .Miuiehester. 



SECOND-HAND TELESCOPES 



uin. Uallmcyer, Kiiualoiial Mount by Cooke, £63 

 •lin. Cooke, Knuatorial, Garden Sland and lion 



Coliiiiiii, £50. 

 Sin. student, null Kinder, 2 Eyepieces, Table and 



Cardili Stands, £6 lOS. 



SECOND-HAND MICROSCOPES 



Baker's Nelson No. 2, complete 



with aceessoiies, l 



Watson's Kdinburgh H Bao- 



teric.logieal OutUt, 



Swill's Baetrriolosrieal, Viest 



, £16 OS. 

 } £16 10s. 

 ' £14 10s. 



Itattern. loinplctL', 



STANDARD BAROMETER 



by Pastorelli & Rapkin. Perfect order, £5. 

 Many other), nil kiiuh. X,w Liah on Ai>pUcaliun. 



A. CLARKSON &, CO., 



«8, Bartletfs Buildings, Holborn Circus, London. 



MICROSCOPY. 



H. W. H. DARLASTON, 



20. FREER ROAD, BIRCHFIELD, BIRMINGHAM. 



Preparer of all kinds of Microscopical 



Slides (Sample yd.) 



MEDIA AND ACCESSORIES FOR MOUNTING. 



TUITION BY CORRESPONDENCE. 



CIRCULATING SYSTEM OF SLIDES, 



witlj great advantages to siibsciibers. Particulars 

 on application. 



MICRO. OBJECT MOUNTS. 



Interesting Slide; VOLCANIC DUSTS, Vesu- 

 vius laOUand Soutiiire l'.IU2, on one slip, 1/4 post free 

 9 Doubly Stained BOTANICAL Sections. 6 IN- 

 SECT Dissections. 9 Varieties of DIATOMS 

 Uome test). 18 MISCELLANEOUS objects. 

 Full instructions for mounting. Per Series, 1/1 post 

 free. Sample section and price list, 2 stamps. 

 tV Ste Micro. Editor's remarks, Jan., '06, Issue. 



R. G. MASON, 69, CLAPHAM PARK ROAO, LONDON. S.W. 



Vj years' reputation fur <jii<tlili/. 



LIVING SPECIMENS 



FOE THE 



MICROSCOPE: 



VoItoi globator, Desmids, Diatoms, Spirogyra 

 Amoeba, Aotinophrys, Spongilla, Vorticella, Btentor, 

 Hydra, Cordylopohra, Stephaooceros, IVlelioerta, 

 Polyzoa, and other forms of fond Life, is. per tube, 

 withprinted drawing, post free. Thomas Bolton, 

 MaturaUst, 25 , Balsall Heath Road, Birmingham. 



MICROSCOPIC SLIDES. 



Choice Selected DIATOMS, mounted in Styras. 

 Large variety British and Foreign Specimens, twists 



tree. Slides on approval. 

 ••MICRO," 7, PARKEND STREET, BELFAST. 



Bv?WiLi.iAM Peck, f.r.s.. fb«f_ 



OF THE HEAVENS. 



30 LARGE-SCALE STAR CHARTS, 



Covering iIk' wlidc star spbirr. Catalogues 



of Double, Variable, and Coloured Stars, Nebu'a-, &c 



Full Atl«9 Size 21/- Net. 



THE CONSTELLATIONS AND HOW TO FIND THEM. 



1 1 I'l.in-., .|i,i : 

 \. II. inis.inrr, 2/6; K, 1 biiiisplicre. 3/6. 



CALL a INGLIS, 23, Paternoster S quare, London. 



CHANCE : A Comparison of Facts 

 with the Theory of Pf obubilitle.s. liy 



Josi-.ni t OMEN (London: C. & K. I.aylon, 

 pp. 4S; price 2/. net). Author of '■ Monthly kcpav- 

 iiients " and " Present Value Tables." 



Second-hand Books at Half Prices! 

 New Books at 25 „ Discount. 



2"."-l';,.i';. "" •"■""■hes of SCIENCl- and 

 NATURAL MLSIORV and for All Examina- 

 tions (I'.leineiitaiy and Advanced) suiiplied. Sent 

 on approval. Lists Pri'e. state Wantj. Books 



Bought. Good Prices given. 

 W. & G. FOVLE, 13S, Charing Cross 



Road, London, W.C. 



r/'"i' n iiinites frovt Itxford St.) 



TUITION BY 

 CORRESPONDENCE. 



(Katdtuce abroad no iiiij'ttliiiiinl.) 



J;fAx?o'^I'"^'-''''^TJON, B.A., B.Sc, RliSPON- 



falONS, SCHOLARSHIPS, and PROFESSIONAL 



PRELIMINARIES. 



Tuition in Latin, Greek, French, German, Italian, 

 Spanish, Mathematics, Mechanics, Physics. Chemis- 

 try. Psychology, Logic, Political Economy, Book- 

 Keeping 



'1 he staff includes graduates of Oxford, Cambridge 

 London, and Koyal Universities. 



Address Mr. J. Charleston, B.A., Burlington 

 Correspondence College, Clapham Common, Lon- 

 don, S.W. 



CORRESPONDENCE 

 TUITION. 



MOST successful methotJ. Work sheets 

 "* a specialit}', saving time and trouble. 

 Every pupil treated individually. Splendid 

 places taken, mostly at first trial, by can- 

 didates for Universities, Civil Service, Bar, 

 Army, and all Public E.^taminations. 



Full farticiihin on application to— 



JOHN GIBSON, M.A., 



24, CHANCERY LANE, LONDON, W.C. 



CLARKE & PAGE, 



Specialists in Microscopy, 



104, LEADENHALL STREET, LONDON. 



Students' Microscope (New Model). 



4 Powers. Eyepieces, Polariscope, Spot Lens, Live 

 Box, Static l-orcejis, &c., comidetc, £4 7 6. 



MARINE SLIDES.-Zoophytes fully 



expandud as in life, our own preparation ; beautiful 



niujiits of Medusae, Mollusca,&c., Phyllir- 



rhoe with entire anatomy visible ; Insect pans 



\vilhoiit pressure. 



Stock of 20,000, all branches. 



New Catalogue, also Second han 1 List of Stands 



and Accessories, Now Keady, free. 



BOTANICAL MICROSCOPIC 



SLIDES FOR STUDENTS, 



Including Four Series, 50 Slides in each. Price 

 £1 Is. per series; illustrating Mitosis, Leucoplasts 

 Ihyloses, Koot, Stem, and Flower Devolopment 

 Anomalous Stems, Embryo-sac Structure, Pollen 

 Tubes, Alga;, Fungi, Antboceros, Pilnlaria, Marsijia 

 Iscetes, Seiagmella, Pinus, etc. Catalogue Post Frea. 



A. PENISTON, s, Montpelier Terrace, Leeds. 



CHEAPEST MICROSCOPE SLIDES, 



Fou E.VHiniTtoN oa Stdlv. 

 6d. each, 12 5/6, 25 10 6, 80 £1. 



H. E. ERRAflP '■♦• Orchard Road, 

 n. c. CDDAUe, Kingston-on-Thames. 



AND FINE PHOTOGRAPHS 



are closely allied. Vou can ifet the best 

 neRutlve.s only by havlni; u len.s capable ol 

 (flvinic keen definition at u lur|{e aperture. 

 In a Cooke lens you jfel both Iliese qualities 

 in the highest deRree, because it consists of 

 only three Ih n glu.sses unceniented, which are 

 specially adju.slable by us to obtain maximum 

 definition. 



.VcHit a j,.)i(i-<ir.(, iyi(. ./(»;/ Zls,;, t»r our new tm>Ktet. 



TAyLOR..TAyLOR.t'[1oB50tl ,(:' 



!■•. Lcictkitn. 



"AUKS," LONDON. 



Tslepboa* : 



ESTABLISHED 1760 



Stevens' Auction Rooms, 



38, KING ST.,GOVENT GARDEN, LONDON, W.G, 



Kvery FniDAT at 12.30, Haloa are hold at the 

 Rooms of MioRoMCOi'ES, Micuosoopio Slioks, Tklk- 



SCOl'KS, THIOOOLITKS, LkVBLS, El.HCTIllOAL AND 



BoiBuriPio Apparatus, Caueras, and all kinds of 

 Photoobaphio Apparatus, Lanterns, Lantern 

 Slides, and all Accessories in great variety, by 

 best makers. 



Natural History Sales onoa and Iwioe a 

 montb. 



Curiosities, War Relics, Postage Stamps, 

 onoe a month. 



Cataloguti and all Partieulari of BaUt. Poll Free. 



ValoatlonB for Probate or Transfer, and Bales 

 conducted In any part of the C ountry. 



To improve your Telescope, use 



STEINHEIL'S 



ASTRONOMICAL EYEPIECES. 

 In Stocli, at Steinheil's list prices. 



Steinheil's Improved Huyghenian . . 10/- each, 

 do. Achromatic, of great 



brilliancy 21/- ,, 



do. Monocentric . . . . 21/- ,, 



STEINHEIL'S HIGH-CLASS ASTRONOMICAL OBJECT 



GLASSES AND TOURIST TELESCOPES 



A. CLARKSON & Co., 



338, HIGH HOLBORN, LONDON. 



(Opposite Gray's Inn Road.) 



minerals ! 



Those requiring TYPICAL SPECIMENS 



of MINERALS for TEACHING. PRIVATE 



STUDY, COLLECTIONS, MUSEUMS, or 



EXPERIMENT, 



Can obtain all they require, at very 

 moderate prices, from 



JAMES R. GREGORY & CO., 



139, Fulham Road, South Kensington, 

 LONDON, S.W^ 



MINERALS AND ORES 



BOUGHT AND EXCHANGED. 



SAVAGE CURIOSITIES. 



Stock of over bixjo Specimens of Weapons, luiple- 

 nients, Ornaments, Dress, Idols, Musical Insirninents, 

 &c., &c., used by all the Races of Mankind, for sale at 

 very low prices. All objects guaranteed genuine. Tro- 

 phies of genuine old Anns made for Billiard Rooms, 

 Halls.Ac.prices from 25s.; also mounted Horns. -Cata- 

 logue of Ethnographical Specimens illustrated with 

 Bromide Photographs, 4,d. monthly, 3s. 6(f. yearly. Col- 

 lections Arranged and L.aialogued. Specimens bought. 



W. 0. OLDMAN, 77, BRIXTON HILL, LONDON, S.W. 

 F. WIGGINS & SONS, 



102 & 103, HIN0RIE8, LONDON, E, 

 Contractors to H.H. 

 Oovernment. 



LA IMPS 

 STOVES 

 VENTILATORS 

 ELECTRICAL WORK 



AND ALL PURPOSES 



Largest Stock in the World. Tel No. 2248 Avenue 



