KNOWLEDGE. 



October, 1910. 



CIVIL SERVICE COMMISSION. 



FORTHCOMING EXAMINATION. 



CARTOGRAPHKRS in the HVDROQRAPHIC 



DEPARTMENT of the ADMIRALTY (17-25) 



loth November. 



The date specili^-d is tlie latest at which applications 

 can be received. They iinist be made on Tornis tn be 

 obtained, with particular'^, from the Secrftarv. Civil 

 Service Conimissioii. lUirliiigton Gardens. Londnn. \\ . 



CIVIL SERVICE COMMISSION. 



FORTHCOMING EXAMINATION. 



ASSISTANT in the ROYAL OBSERVATORY. 

 EDINBURGH (21-25). 20th OCTOBER. 



The dale spL-i ihed is the latest at ahicli .ipplicatioiis 

 c.'.n lie receiver!, They must be mail'j on forms to be 

 nbiaincd, with parliculais. I'loin the Skcketarv, Civil 

 Service Commission, liurlington (lardens, London, \V. 



SECOND-HAND TELESCOPES. 



T.l-'w. Zeiss Apoclimmatu:. on _ I alile 



Stand, Finder. Erecting Eyepiec:^. 5 



Astro. Eyepieces, Travelling Case. 



as new .. ^£28 lO O 



4-ln. Wray, i Day and 2 Astro. Eye- 

 pieces, Finder, .Altaz. Stand . . 

 ^-in. Hug-hes, on Equatorial (no circles), 



Finder, i Day and 2 Astro. Eyepieces 

 vin. Aitchison, Vertical Rack, Finder, 



I Day and i Astro. Eyepiece, in case. 



complete 

 3-in., 1 Day and i Astro. P^^yeptece, and 



Finder 



3-in. Student's •\-<. do. 



6h ill. Browning F',i|iiatorial Reflect-ir.. 



bl-'in. Calver Ah.L/imniii do 



SECOND-HAND MICROSCOPES. 



Beck l',.i.n.ri..l>.jh,il 



Leitz 'li. 



Watson do. Kilinl.urgll H mo^lcl 



complete . . 

 Beck Binocular 

 Swift ■•r)i^ClJVel^" 



Bausch & Lomb Student's, = and ,' 



Objecti\es, I Eyepiece, Uoiible 

 Nosepiece . . . . . - 5 ** O 



Beck Dissecting, 4 powers . . 2 50 



AUo Arcrssories. I'aliinels. and Oliiecis Lis/ /r.v. 



CLARKSON'S SECOND-HAND OPTICAL MART, 



33S, HlliH HULBORIS. L<)M)(>f\. 



(Opposite Gray's Inn Ru.id ) 



To improve your Telescope, use 



STEINHEIL'S 



ASTRONOMICAL EYEPIECES. 



In Stock, at Steinheil's list prices 



.Steinlieil's Improved H nyi^heni.m In -each. 



do. .\ctiroiiiatic, of great 



brilliancy .. .. 21 - ,, 



do. M .icenlric L'l - .. 



STEINHEIL'S HIUHCLASS ASTKdNOMIC AI, OBJECT 

 GLASSES AMI TdlRlST TEl.ESCdl'ES. 



A. CLARKSON & CO., 



338, HIGH HOLBORN, LONDON. 



(I Ipi'oNite (iray's Inr, Ko.icl. ) 



SECOND-HAND 

 PRISM 

 ,^S_ FIELD GLASSES. 



^ A. ^' fe*^ W^SffiS^^H I "ss s< £11 I,-, 



*lil3 i-)W?-^^^« "-^ SX £4 15 

 ^"— '--'■'— """■^<™~" ,,.R2 9X f4 15 



CLARKSON'S, 



-t' ' London. 



The Second-hand Optical Mart, opposite Gray's liin Rd. 



Rougti Precious Stones for 

 Prospectors, &c. 



A case of alii'vc i;(j|i->islin;^ dI 20 vaiiclic.^ aiiii 



various specimens nf each, sliowing colour, i.\;c. 



Price 42/- 



JAMES R. GREGORY & Co., 



Mineralogists. 



139, Fulham Road, South Kensington, 



Tchphone, 2S4! \V.-,U-rn. LON DON. S, W. 



Telegraph k Address^ '''' Meteorites, London." 



TUITION BY 

 CORRESPONDENCE 



For MATRICULATION, B.A., B.Sc, an.l 

 othei UMVKKSITY ami PROFESSIONAL 

 EXAMINATIONS, an.l f r INDEPENDENT 

 STUDY. 



Thf Staff conjists of Graduates of O.vford, 

 Cambridiie, London, Dublin, and Royal Universities. 



.-J^r'f^rlv— Mr. J. Charfkston. B.A., P.urlinL;ton 

 C.irrespondence College. IJirkbeck Bank Chambers, 

 Lo ndon, W.C. 



BOTANICAL MICROSCOPIC 



SLIDES FOR STUDENTS, 



Including Four Series, 50 Slides; in each. Prii-t:: £^\ I^. 

 per series ; illustrating Mitosis, Leticoplasts, Thyloses, 

 Root, Stem, and Flower Development, Anomalous 

 Stems, Embryo-sac Structure, Pollen Tubes, Alga.-. 

 Fungi. Anthoceros, Pilularia. Marsilia Isceles, Sela- 

 -in..-!la, Pinii-;. etc. Catalo-^uf I'ost Free. 

 A. PKNI5T0N, 5, Montpelier Terrace, Leeds. 



MICROSCOPY. 



New and interestinc OBJECTS preiiired 

 NATURALLY, ie . WITHOUT PRESSURE 



for dark i;round illuminution. 

 Fresh Water and Marine Slides.— /'i?/)'it"i. Uydrozou. 



tivteiiikd as in life, heautifnl mounts of Meditso\ 

 Moihts-a, ^'c, Phylliryhoe with entire anatomy vis- 

 ible, Fish f>arasites.,J!ukes, &^c. To those who ha\'e 

 not seen the above ihey are a revelation of the beauty 

 t.> lie found in the fauna of our own and tropical seas. 



Insect Parts. — Head n^ Hand ll'as/> with fine mouth 

 i<rL;ai!s, entire S/iny Plant Hug fiom Ceylon ; also the 

 rare Wild 1-ee-p^rasite Styio^s, young Trap-door 

 S/ider, iSr't., &^e. 



Our lists contain besides the above, Geological. 

 Jlotaniiiil. Pintoms. o-'.".. Ss^c. 



SECOND-HAND. 



iMicrttSCOpes, iSc. -I'ils.jiii stuck includes instruments 

 by W'aison. Ross. Zeiss, Pillischer, &^c. 



Ohjectives. — A large number in stock from y\\^. to 

 y'.-lh. by leading makers. 



Accessories. — Eyepieces, Polariscopes, Selenite 

 stages. S.S. reflectors. Condensers. Spot lenses, Nose- 

 pieces and a fine large Microtome. 



Full lists of abo7^e. post free. 



Uf AUTCn Microscopes and Accessories, of all 

 WAWItU. ;^j,„k; ,„„. i,,,,,.| ,,, exchanged. 



CLARKE & PAGE, 



Please Sote Sew Address : 



23, Thavies Inn, Holborn Circus, 



LONDON. 



LIVING SPECIMENS 



FOR THE 



MICROSCOPE. 



Vol\o\ globator, De^niid-. Diatoms, Spiiogyra 

 .-\mceba, Actinophrys, Spungilla, Vorticella, Stentor. 

 Hydra Cordylopohra, Stephanoceros, Melicerta. 

 Polyzoa, and other forms of Pond Life, "Is. per tube, 

 with printed drawing, pust free. Thomas IJolto--. 

 Naturabst, .-5, nals.iM llf.-.tli Road. P.innin-li.nn. 



IVIICRO'OBJECTSforlwounting. 



,j 1 i..ir!.l\ -^t.inir,! r.utani. .d >eLlii.ns, 



10 Mi.sccllaneous Specimens, 6 Insect Parts, 



Is. Id. per Series, with full instructions, p ^st free. 



|*~ Sec Micm. Editors remarks, Jan., 'oq. 

 pKiLtical Hints un Mounting, with specimen. 



6 stamps. 



R. G. MASON, 78. Foxbourne Road, 



Upper Tootiny:, London, 5. VV. 



ASTRONOMICAL TELESCOPES. 



:;-iii. Table Stand «ilb » eve-pieces S.\ 10 



3-in. Garden Stand «ali 3 eye-pieces .. 8 111 



V:,-\\\. Garden Stand with 3 eye-pieces .. 12 10 



4-in. Garden Stand willi 4 eyepieces ., 20 



SECOND - HAND LANTERNS. 



Oil, Limelight, Electric. 



SECOND-HAND LANTERN SLIDES. 



By all the Leading Makers. 

 Also Rei:;iiIator.*^, Jets. I. e uses, &c. 



SECOND-HAND MICROSCOPES. 



W.Uviii's Kdiid.ur-h Student, complete £10 



Heck's Lai ge London, complete .. . S 10 



.Swift's riiscovety, complete .. .. .'> I,i 



W.ils.in's Standard, coinpkle ,. .. .ilO 



Lists on at-plication. 



BROADHDRST, CLARKSON & CO., 

 63, Farringdon Road, London, E.G. 



Late 3b Je.tis tis, I'.attlett's IbuIdillL^s. 



Teleevanis : Telephone : 



"AUKS," LONDON. S24 GERRARD 



Established 1760. 



Stevens' Auction Rooms, 



38, KING ST., COVENT GARDEN, LONDON, W.C. 



RLvery pRinAV at 12.30, Sales are held at the 

 Rooms of MicKOScopES and Slides, Telescopes, 

 Surveying Insfkuments. Electrical and Scien- 

 tific Api-aratls, Cameras and Lenses, Lanterns 

 and Slides, Cinematographs and Films, in great 

 \'arietj', Lathes and Tools, Etc. 



floods may be sent for iticlusion In early S.iles. 



Settlements made one week after disposal. 



Catalogues and all Particulars Post Free. 



Valuations for Probate or Transfer, and Sales con- 



ducted in any part of the Cttuntry. 



— The Whole 

 5tar Sphere. 



^i;y \V. Peck, F.R.A.S. 

 - Charts & 1,020 Illustra- 

 . m.s of I_>ouhle Stars. Most 

 •i.-ful for reference and 

 i.ikina; Notes, marking 



Tracks of Comets, etc. 



•I! tains Catalogues of 

 *,>ul'h\ Variable, and 

 loured .Stars, NcdulcF, etc. 



iVct" Readv. Pros/>ei'fus on application. 



5/- NEW STAR ATLAS 



ii't. and Telescopic Handbook. 



16 Charts, covering ihi; Star sphere. slu>\v_ing nearly all 



ohjects in— (positions for 1920). 



WEBB'S CELESTIAL OBJECTS. 



SMYTH'S CELESTIAL CYCLE. 



rii.'paM:(I with -reate^t care hy A. P. Xnr'.on. P.. A. 



GALL & INGLIS, 31, Henrietta St.. London, W.C. 



THE SCIENTIFIC APPLIANCE 

 MANUFACTURING CO. 



F.>r rv.ivihln^ ELHCTRICAL, O ALVA NIC. 

 MAGNETIC. OPTICAL and SCIENTIFIC. 



\Vires, Ehonite, Lamps, Terminals, Coils, P.clls, 



Castings. Accumulators from 3s. 6dt 



Neiv bo page Electric Catalogue free. 



X-Kay Coils, Static Machines, Experimental and 



Inventors' Work. 

 Siemens' .jelehrated Obach and Hellesen Dry Cells 



aiii.i many nilier Ixitteries from ud. 

 Model Aeroplane Materials. 



Wireless Teleg^raphic Materials. 

 PR15MS, LENSES. TELESCOPE PAKT5, 



OPTICAL MATERIALS, //.v/.v. 

 Practical Mechanics and Electricians. Large Work- 

 shops. Repairs on the premises. 

 PROMPT I CHEAP! RELIABLE! 

 HENRY J. DALE has had vast experience; 

 wiite ns — 



15, NEW OXFORD STREET, LONDON, W.C. 



MiNERALOGICAL 



Specimens. 



ALL KINDS & FKICES Idlt STl I)K\ TS & TKACHKKS. 



ROUGH 



PREC IOUS STO NES. 



G. H. RICHARDS & Co., MINERALOGISTS &c. 



Shoio Kcoins^'i, lieauch.imp Place, 



Brompton Road, London, S.W. 



Collections or Single Specimens of 



CHOICE MINERALS. 



FOSSILS and ROCKS. 



All kin'ls'jf i^abiiicts, lili<^--i-'ippfd Boxes, Card 



1 lavs, Hammeis, Blowpipe Cases, &c. , .Sic. 



ROCK SECTIONS, 9d. each. 



4.000 CHOICL MICROSCOPICAL OBJECTS, in all 



dcpartnieius iil Natiiii;, 6d. each. 



Tr» DITGCTj'TT 11. John St.. Theobalds 

 . iJ. nUOO£iljJ-<i Road. London. W.C. 



