KNOWLEDGE & SCIENTIFIC NEWS. 



[March, 1907. 



FOR SALE.— To Close Estate. 



First-class BINOCULAR MICROSCOPE, bv 

 Bi 1 k,mi chanicalstagewithconcentricmotionbyracfc 



an. I pinion, scp.ir.itr Moiioculu body with divided 



drawtube, Substage with rack and pinion focussing 

 andcentringadjustments, Achromatic condenser with 

 iris diaphragm, 2 silver side reflectors, Camera 

 lucida, erector, and various other pieces of appara- 

 tus. The whole contained in handsome Spanish 

 mahogany case, £40 0. Cost £82 10 0. 



MONOCULAR MICROSCOPE, by Watson 

 l" Pram ">, has mechanical stage, centring substage 

 with rack pinion and screw. The whole in new con- 

 dition in mahogany case, price £6 10 0. Cost £8 6 0. 



TABLE SPECTROSCOPE, by Browning, 8 

 prisms, rack tube and collimator, scarcely used. 

 In mahogany case, £10 0. Cost £15 0. 



Can be ten h}i Appointment or any Particular* of 



Executor*. 



199, South Lambeth Road, London, S W. 



FOR SALE — Second- Hand . 



Microscope Slides, 6/- dozen. 



Mahogany Cabinet, for i.ooo, £3 15s. 



Bacteriological Microscope, Spencer (New York) in- 

 eluding ,V. oil immersion, £10 ISs. ; bargain. 



Beck Medical Student's Microscope, '\ and J by 

 Zeiss (A. & D.)i £4 18s. 6d. 



Watson's Edinburgh Microscope, I in. & *, in., £5 5s. 



Calver's ttiin. Reflecting Telescope, nearly new, 

 with slow ii m ■! m >ie., £15. 



5 in. genuine old Wray, with Stand, £45. 



Equatorial, Cooke's best pattern, for 3 in. to 4 in. 

 (Offers.) Many others— all kinds and makers. 



Clarkson's Second-Hand Optical Hart, 338, High 

 Holborn, London (opposite Gray's Inn lt<t ). 



ON SALE.— Astronomical Tele- 

 scope by WRAY, 4$ in. clear aperture, 

 cradle support, tripod, finder, £32. Anotheb, by 

 Solomons, 3if in., magnificently made through- 

 out, two steadying telescopic rods to big end, one 

 racking steadying rod to eyepiece, slow motion, 

 tripod, will respond to most rigid test, £19, 

 Chemical Balance, Agate bearings, jast 

 overhauled by Oertlino, load 100, sensitive 

 j 1 ,, milligramme, cost £'16, price £6 10s. Zeiss' 

 Prismatic Binocular, sling-case, £5. 

 Chronometer by Arnold, £5. Transit 

 Instrument by TfioroHTON & Simms, circular 

 stand in brass, adjusting screws, striding level, 

 £6 10s. Miner's Level, complete as new, cose 

 £24, price £7. Portable Microscope in 

 case, by Beck, £2. Society of Arts Micro- 

 scope, complete in case, £1 10s. 

 JOHN LACKLAND, 30 Blackfriara Street, Salford, 

 Manchester. 



SECOND-HAND TELESCOPES 



Gin. Dallmeyer, Equatorial, Clock, complete, £80. 

 4 in. Cooke, Equatorial and Clock, complete. £60. 

 3$ in. Cooke, Altaz., complete, nearly new, £17 10s. 



SECOND-HAND MICROSCOPES 



Baker's Nelson No. 2, complete 

 with accessories, 



Watson's Edinburgh H Bac- 

 teriological Outfit, 



Swift's Bacteriological, best 

 pattern, complete, 



£16 0s. 

 £16 10s. 



£14 10s. 



STANDARD BAROMETER 



by Pastorelll & Rapkin. Perfect order, £4 4s. 



Many others, all kinds. New Lists on Application. 



A. CLARKSON &. CO., 



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



microscopyT 

 h. w. h. darlaston, 



20, FREER ROAD, BIRCHFIELD, BIRMINGHAM. 

 Preparer of all kinds of Microscopical 



Slides (Sample 7d.) 

 MEDIA AND ACCE SSORIES FOR MOUNTING. 



TUITION BY CORRESPONDENCE. 



CIRCULATING SYSTEM OF SLIDES, 



with great advantages to subscribers. Particulars 



on application. 



f&~ See Micro, Editor's opinion, Jan. '07 issue. 



MICRO. OBJECT MOUNTING. 



DO YOUR OWN AND MAKE FIRST CLASS 

 SLIDES AT LITTLE COST. 



9 Doubly 8tained BOTANICAL Sections. 6 IN- 

 SECT Dissections. DIATOMS. FORAMS. 

 POLYCISTINA. Also MISCELLANEOUS 



Specimens. 1/1 per Series. Full instructions with 

 each Series, r-pecimen botanical section and price 



list 2 stamps. 

 9W See Micro. Editor's remarks, Jan. '06, ■ Knou-ledye.* 



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

 25 years' reputation for quality. 



By William Peck, f.ra.s. f.r.s.e. 

 9 Sll 3 UN 



OF THE HEAVENS. 



30 LAROE-SCALR STAR CHARTS, 



Covering the whole star sphere. Catalogues 



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



Full Atlas Size 21/- Net. 



THE CONSTELLATIONS AND HOW TO FIND THEM. 



14 plates, 4to : 



N. Hemisphere, 2/6; S. Hemisphere, 3/6. 



GALL A INOLIS, 23, Paternoster Square, London. 



CHANCE : A Comparison of Facts 

 with the Theory of Probabilities. Hy 



Joseph Cohen (London: C. & K. Layton, 

 pp.48; price 2/- net). Author of "Monthly Repay- 

 ments " and " Present Value Tables." 



Second-hand Books at Half Prices! 

 New Books at 25 % Biscount. 



Books in all branches of SCIENCE and 

 NATURAL HISTORY and or All Examina- 

 tions (Elementary and Advanced) supplied. Sent 

 on approval. Lists Frre. State Wants. Books 



Bought. Good Prices given. 

 W. & G. FOYLE, 135, Charing Cross 



Road, London, W.C. 



(Tivo minutes from Oxford St.) 



TUITION BY 

 CORRESPONDENCE. 



{Residence abroad no impediment.) 



For MATRICULATION, B.A., B.Sc, RESPON- 



SIONS, SCHOLARSHIPS, and PROFESSIONAL 



PRELIMINARIES. 



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

 Spanish, Mathematics, Mechanics, Physics, Chemis- 

 try, Psychology, Logic, Political Economy, Book- 

 keeping. 



The staff includes graduates of Oxford, Cambridge, 

 London, and Royal Universities. 



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

 Correspondence College, Clapham Common, Lon- 

 don, S.W. 



CORRESPONDENCE 

 TUITION. 



MOST successful method. Work sheets 

 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 Examinations. 



Full particulars 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, Stage Forceps, &c, complete, £4 7 6. 

 MARINE SLIDES.— Zoophytes fully 



expanded as in life, our own preparation ; beautiful 



mounts of Medusae, Mollusca,&c . Phyllir- 



rhoe with entire anatomy visible ; Insect parts 



without pressure. 



Stock of 20,000, all branches. 



New Catalogue, also Secondhand List of Stands 



and Accessories, Now Ready, free. 



fAV~ See Microscopy Col., Dec. '06 issue, pane 621. 



BOTANICAL MICROSCOPIC 



SLIDES FOR STUDENTS, 



Including Four Series, 50 Slides in each. Price 

 £1 Is. per series ; illustrating Mitosis, Leucoplasts, 

 Thyloses, Root, Stem, and Flower Devolopment, 

 Anomalous Stems, Embryo-sac Structure, Pollen 

 Tubes, Algfe, Fungi, Anthoceros, Pilularia, Marsilia 

 Iscetes, Selaginella, Pinus, etc. Catalogue Post Free. 

 A. PENISTON, 5, Montpeller Terrace, Leeds. 



POPULAR MICROSCOPE SLIDES, 



For Exhibition or Study. 

 6d. each, 12 5/6, 23 10/6, 50 £1. LIST. 



„ ..„„.„,. 14, Orchard Road, 

 H. E. hIJBAUt, Kingston-on-Thames. 



(ookcIenscs 



AND FINE PHOTOGRAPHS 



are closely allied. You can get the best 

 negatives only by having a lens capable of 

 giving keen definition at a large aperture. 

 In a Cooke lens you get both these qualities 

 In the highest degree, because it consists of 

 only three ihtn glasses uncemented, which are 

 specially adjustable by us to obtain maximum 

 definition. 

 Send <t postcard, quoting Ziw;, for our new booklet. 



Taylor. Jaylo^ fioBSOrl ,fc» 



• TOUCH TOO • 



iCiCtbTlft. 



T«l«framt : 



■AUK8," LONDON. 



T*l«phoaa : 



IM* OKRltABD 



ESTABLISHED 1760 



Stevens' Auction Rooms, 



38, KING ST.,C0VENT GARDEN, LONDON, W.C. 



Every Fbidat at 12.30, Sales are held at the 

 Booms of Microscopes, Microscopic Slides, Tele- 

 boo pas, Theodolites, Levels, Electrical and 

 Scientific Apparatus, Caueras, and all kinds of 

 Photographic Apparatus, Lanterns, Lantern 

 Slides, and all Accessories in great variety, by 

 best makers. 



Natural History Sales onoe and twice a 

 month. 



Curiosities, War Relics, Postage Stamps 

 once a month. 



Catainguet and all Particular! of SaUt, Poll Frtt. 



Valuations for Probate or Transfer, and Bales 

 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 Huyghenian .. 10/- each. 

 do. Achromatic, of great 



brilliancy 21/- ,, 



do. Monocentric . . . . 21 - „ 



STEINHEILS HIGH-CLASS ASTRONOMICAL OBJECT 



GLASSES AND TOURIST TELESCOPES. 



A. CLARKSON & Co., 



338, HIGH HOLBORN, LONDON. 



(Opposite Gray's Inn Road.) 



To Petrologists and Geologists. 

 -Hi ROCKS^ 



Specimens of Rocks may be had at all prices 

 from a very extensive Stock. They can be 

 had also in Collections to illustrate all 

 works on Petrology from . . . 



JAMES R. GREGORY & CO., 



Mineralogists, dec, 



139, FULHAM ROAD, 

 SOUTH KENSINGTON, LONDON, S.W. 



SAVAGE CURIOSITIES. 



Stock of over 8000 Specimens 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, 

 Halls.&c, prices from 25s.; also mounted Horns. -Cata- 

 logue of Kthnographical Specimens illustrated with 

 Bromide Photographs, 4d. monthly, 3S.6d. yearly. Col- 

 lections Arranged and catalogued. Specimens bought. 



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



LIVING SPECIMENS 



FOB THB 



MICROSCOPE: 



Volvoi globator, Desmids, Diatoms, Spirogyra 

 Amoeba, Aotinophrye, Spongilla, Vorticella, Btentor, 

 Hydra, Cordylopcbra, StephanooeroB, Melioerta, 

 Polyzoa, and other formB of Pond Life, is. per tube, 

 with printed drawing, poBt free. Thohas Bolton, 

 Naturalist, 25, Balsall Heath Road, Birmingham. 



MICROSCOPIC SLIDES. 



Choice Selected DIATOMS, mounted in Styras. 

 Large variety British and Foreign Specimens. Lists 



free. Slides on approval, 

 "MICRO," 7, PARKEND STREET, BELFAST. 



