X. 



KNOWLEDGE & SCIENTIFIC NEWS. 



[February, 1907. 



Wanted, fresh-water poly- 



■' ZOA, &c., in (UMiuitN-, //.s.m'ci/ 

 (\lin,li,l, during coinin'< season. — l.etkTS to 

 ' Micro.," care of Knowlmick Olliie 



FOR SALE.— Several tlionsands second- 

 liiiHl MICR05C0PE GLIDES by the Best 

 Mounters, 6/- do/cii. Itotany, Insects ;irul parts, 

 Anatomy, Kock sections, \c. Also SLIDE 

 CABINETS by Beck and olbers. hoUlini; from -•<« 

 to i,ooo sillies. MICROSCOPES— Swift Bacterio- 

 logical. Swmc-out Subst.iue, Abbe Condenser, Iris 

 Diaphragm, Triple Xosepiece, l| in., ,^in , ami A in. 

 Oil Imm. All as new, ^12. I'irst-class Beck Binn- 

 cular, with much Apparatus, (,m. 4 in. ASTRO. 

 TELESCOPE by the oni;,'fal Wrav. Finder, sever.d 

 Kyepieres, (:•,. Manv others, all kinds and maker-,. 

 Clarkson's Second Hand Optical Mart, 338, High 

 Holborn, London (.■|./i.i..i(f Uroii's Imi liil\. 



fiN SALI-: —Astronom'cal Tele- 



^^ scope liy \\ KA\, l{ in. char iiiH rtuie, 

 eradle support, trij-od. Under. f;l2. Anoihick. by 

 Solomons, 3^ in., mngnitlcently made tlirouKh- 

 out, two Btcidying ttle&copic rods to big ind, one 

 racking 8t.ndyit>g rod to eyepiece, plow nivt-on, 

 tripod, will respond to most ri»id test. .1'19. 

 Chemical Balance, Ah'ate bearings, just 

 overhauled by Or.UTLiNo, load 100. seof-it.ve 

 j\, milliLTninine, cost flfi, price A'6 10s. Zeiss' 

 Prismatic Binocular, slingcase, l".. 

 Chronometer by Akkold, IVi. Transit 

 Instrument by Tboitobton & Sim.ms, c.ivular 

 stand in ti'ass. adjusiirg screws, striding level, 

 1'6 lOj. Miner's Level, complete ;is m«. cost 

 .i'24, price i'7. Portable Microscope m 

 case, by Bi-:< k, IJ. Society of Arts Micro- 

 scope, compute in case, I'l 10s. 

 JOHN LACKLAND, :iO lilnekfriars Street, Salford, 

 -Manchester. 



SECOND-HAND TELESCOPES 



r)ia. Dallmeyer, Kquattnial, CNick, complete, £80. 

 4 ill. Cooke, Kqiuitoiiai ;in I Cloi I<. coiiiplei*'- £60. 

 ."iiin. Cooke. .\li i/., i .iTitpirt..-. i,.;iil\ n.u, £17 lOs. 



SECOND-HAND MICROSCOPES 



Baker's Nelson No. 2, complete | «.„ _ 

 with acces'^ories, > ^^' 



Watson's Edmuurgh H Bac- ) «-- .- 

 teriologieat Outfit, ( **'* ^"^• 



Swift's BacterioIof,McaI, best ! 



liattern, rnmpletp 



£14 lOs. 



STANDARD BAROMETER 



by Paslorelli & kapktn. Perfect onler, £4 4s. 

 Many others, ali kinds. Nttv Lists on Application. 



A. CLARKSON &. CO., 



28, Bartlett's Buildings, Holborn Circus, London. 



3VIICROSCOI>Yr 



H. W. H. DARLASTON, 



20, FREtR ROAD, BIRCHFIELO, BIRMINGHAM- 



Preparer of all kinds of Microscopical 



Slides (Sample -jd.) 



MEDIA AND ACCESSORIES FOR MOUNTING. 



TUITION Br CORRESPONDENCE. 



CIRCULATING SYSTEM OF SLIDES, 



with great advantages to subscribers. Particulars 

 on application. 



tm-S,, .l/ii-r.i. Jvii/.r, ,, „i,i„i.n. Jan. '07 issli.'. 



MICRO. OBJECT MOUNTS. 



Interesting Slide; VOLCANIC DUSTS, Vesu- 

 vit s 1900 and Soufiitre l*JU:i, on one slip, 1/4 post fixe. 

 9 Doubly btained BOTANICAL Sections. 6 IN- 

 SECT Dissectioi.s. 9 Varitti s of DIATOMS 

 (some test). 18 MISCELLANEOUS Objects. 

 Full iDstructioi s for mouutiag. Per Seri. s, 1/1 post 

 free. Samp e section and jjrice list. 2 stamps. 

 p^- See Mi ro. Editor's remarks, Jan., Uj6, Is»ue. 



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



i.j ijcar-i' rt'i'iitatton fur ijtiu.ily. 



LIVING SPECIMENS 



FOB THB 



MICROSCOPE: 



Volvox globator, Desmids, Diatome, Spirogyra 

 Amoeba, Actinophrys, Spongilla, Vortioelia, btenior, 

 Hydra, Cordylopcbra, Stephanoceros, Melioerta, 

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

 with printed drawing, post free. Thomas Bolton, 

 Naturalist. 25. Ba*eall He>^th Roaci, Birminerham. 



MICROSCOPIC SLIDES. 



Choice Selected DIATOMS, mounted in Styrax. 

 Large variety British and Foreij^n Specimens. Lists 



tree. Slides on approval. 

 "MICRO," 7, PARKEND STREET, BELFAST. 



OF THE HEAVENS. 



30 LAROE-SCALE STAR CHARTS, 



CoverinR the whole star sphere. Catalo;;ues 



of Double, Variable, and Coloured Stars. Nebula-, &c. 



Full Atl«i Size 21/- Net. 



THE CONSTELLMIONS AND HOW TO FIND THEM. 



It I'l. It.--, .(I": 



N. Ileinisplieie. 2/6; S. I liiiiiipheie, 3/6. 



GALL A INOLIS, 23, Paternoster Square, London. 



CHANCE: A Comparison of Facts 

 with the Theory of Probabilities. Hy 



JoSKi'H Cohen (London: C. & E. Layloii. 

 pp..lS: price 2/. net). Author of " Monthly Ue:).i\- 



iiirnl-;" and " I'rr-M'lil \'aliir Tabic?." 



Second-hand Books at Half Prices! 

 New Books at 25,, Discount. 



Bool<< in all hr>in hes of SCII:NCI; iiil 

 NATURAL MI.STORV and or All Hxaniina- 

 tions (i')lementary and Advaneed) snpp'ied Sent 

 on approval, fusts Pr' e. State Wi.nti. look. 



bfuiclu. Good Prii-es L-ive '. 

 W. & G. FOYLE, 135, Charing Cross 



Road, London, W.C. 



I7'n,i in;/,/,/,'. I'lni'i (Iju'ifl St.) 



TUITION BY 

 CORRESPONDENCE. 



{RtsiJ(iu\- abiihid iw impediment .) 



For MATRICUL.ATION. B.A.. B.Sc , RESPON- 



SIONS, SCHOLARSHIPS, and PROFESSIONAL 



PRELIMINARIES. 



Tuition in Latin, Greek, French, German, Itali.in, 

 Spanish, Mathematics, Mechanics, Physics, Chemis- 

 try, Psychology, Logic, Political Economy, book- 

 keeping. 



The staff includes graduates of O.\ford. Cambridge, 

 London, and Royal Universities. 



.Wdress Mr. J. Charlfston, B.A., Burlington 

 Correspondence College, Clapham Coinnion, Lon- 



don.S.W'. '^ 



CORRESPONDENCE 

 TUITION. 



lyiOST successful method. Work sheets 

 "1 a speciality, 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.xaminations. 



Full particulars on application to^ 



JOHN GIBSON, M.A., 



21. CHANCERY LANE, LONDON, W.C. 



CLARKE 



Specialists in 



LEADENHALL STREET, LONDON 



& PAGE, 



Microscopy, 



Students' Microscope (New Model). 



4 Powers, Eyepieces, Polariscope, Spot Lens, Live 



Box, Stage Forceps, &c., complete, £4 T 6. 

 MARINE S LI DES.—Zoophytes fully 

 expanded as in life, our own j/reparalion : beautiful 

 ntounts of Medusae, Mollusca, &c , Phyliip- 

 phoe with entire anatomy visible; Insect parts 

 without pressure. 

 Stcck of 20,000, all branches. 

 New Catalogue, also Second-hani List of Stands 

 and Accessories, Now Ready, free. 



/-// '■,,'.. 71, 



,(, liJl. 



BOTANICAL MICROSCOPIC 



SLIDES FOR STUDENTS, 



Including Four Series, 50 Slides in each. Price 

 i'l Is. per series; illustrating Mitosis, Lcucoplasts. 

 Thyloses, Root, Stem, and Flower Development, 

 Anomalous Stems, Embryo-sac Structure, Pollen 

 Tubes, Algre, Fungi, Anthoceros, Pilixlaria, ^Iarsiiia 

 Iscetes, Selaginella, Finns, etc. Catalogue Post FrL-.-. 

 A. PENISTON, 5. MontpeUer Terrace. Leeds. 



POPULAR MICROSCOPE SLIDES, 



For ExHiutTioN or Stchv. 

 6d. eacli, 12 5 6, 25 10 6, 50 £1. LIST. 



Ht: CTRRAnc; '•♦. Orchard Road, 

 . fc. tlJt5AUt, Kineston-on-Thames. 



BADGER-HAIRS, 



Clean, White-pointed, offereii by .JACOB 

 KORXEE, Manufacturer, H Hallefchestrasse, 

 Wahren, near Leipzig, Germany. 



AND FINE PHOTOCRAPHS 



tire clo.sely ulllcd. N'oii can jfet the be.st 

 neifutlvcs only hy huvinu: u len.s cupahle o( 

 Ifivinif keen definition at a liirite iiperliire. 

 In II Cooke iin.s you Ket both these qualities 

 in the hil,'llest decree, because it consists of 

 only lliree l li n t:lusses iincemented. which are 

 specially udju.sluble by us to obtain maximum 

 definition. 



.S'l'jKt ,( p,),<tiV(rf/. <lii'ilin'i '/.im. far our jii'w haoklrt. 



Taylor.. TAVLOi^t'lloDSOfJ L'» 



> nunxi, LtiCCbTI 



ToIeKramt : 

 "AUKS," LONDON. 



Telsphona : 

 t8-i4 UKHBAIID. 



ESTABLISHED 1760- 



Stevens' Auction Rooms, 



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



Every Friday at 12,30, Sales are held at the 

 Rooms of MioRoscopEB, Mhjuosoopio Slides, Telk- 

 scoi'Bs, Thkodolitrs, IjiiVELS, Elkctrical and 

 SoinNTiFJO Apparatuh, Cameras, and all kloda of 

 Photographio Apparatus, Lianterns, Ijantbrn 

 Slides, and all AooEasoRiEs in great variety, by 

 best) makers. 



Natural History Sales onoe and twice a 

 month. 



Curiosities, War Relics, Postage Stamps 

 once a month. 



CalaUigufi and nil Particulan of 8aUi, Poit Free. 



Valuations for Probate or Transfer, and Sales 

 conducted In any part of the Country. 



To improve your Telescope, use 



STEINHEIL'S 



astronomical eyepieces. 



In stock, at Steinheil's list prices. 



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

 do. Aciiromatic, of great 



brilliancy 21/- ,, 



do. Moiiocentric . . . . 21,'- ,, 



STEINHEIL'S HIGHCLASS ASTRONOMICAL OBJECT 



GLASSES AND TOURIST TtLESCOPES. 



A. CLARKSON & Co., 



338, HIGH HOLBORN, LONDON. 



(Oppo=.ite Gray's Inn Koad ) 



LIS T OF FOSS ILS. 



JAMES R, GREGOHY & CO. have had 

 printed a List of about 1,000 of the more 

 common and characteristic British Fossils, 

 (representing abouc one-fift.h of their stock of 

 Fossils) . This List is very suitable for naming 

 and arranging collections. Post free, 3Jd. 



Collections and Specimens of Fossils, 

 Minerals, and Rocks a Speciality. 



JAMES R. GREGORV & CO., 



Mineralogists, &c., 



139, FULHAM ROAO, SOUTH KENSINGTON, LONOON, S.W- 



SAVAGE CURIOSITIES. 



Stock of over Sooo Speciineas of Weapons, Imple- 

 ments, Ornaments, Dress, Idols, Musical Instruments, 

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

 very low prices. All objects guaranteed genuine. Tro- 

 phies of genuine old Arms made for Billiard Rooms, 

 Hails.&c.prices from 25s.; alsomounied Horns. -Cata- 

 logue of Ethnographical Specimens illustrated with 

 Bromide Photographs, 4'/. monthly, 3S.6rf. yearly. Col- 

 lections Arranged and catalotjued. Specimens bought. 



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

 F. WIGGINS & SONS, 



102 & 103, HINORIEB, LONDON, E. 

 Contractors to H.M. 

 Government. 



LAMPS 

 STOVES 

 VENTILATORS 

 ELECTRICAL WORK 



AND ALL I'CItrOSES 



Largest Stock in the World. Tel No. 2248 Avenue 



