SCIENCE- G OSSIP. 



THE CAMBRIDGE 



SCIENTIFIC INSTRUMENT CO. 



NEW ROCKING MICROTOME. 



1900 PATTERN, [Patented.] 

 This Instrument possesses the following 

 great improvements over the old type of in- 

 struments :— (i) Increased rigidity. (2) The 

 impossibility of catting thin and thick sections. 

 (3) The impossibility of tearing sections on 

 the upward movement of the object. (4) A 

 graduated arc for showing the thickness of the 

 sections. (5) Catch for holding the object 

 above the edge of the razor. (6) Improved 

 method of fixing the cord. (7) A new object 

 holder. 



Price (lacludias object holder) £5 O O 



Write for Pamphlet descriptive 0/ the above 



fnsiyufnent. 



Address all communications : — 



INSTRUMENT COMPANY, CAMBRIDGE. 



HllCnil'C MICROSCOPICAL 

 MAOUN O ... PREPARATIONS. 



Series of 9 doubly stained Botanical Sections ; 6 Insect Dissections ; 



iS Miscellaneous objects. M per Series. Quality Guaranteed. 



All beginners should read " Ppaetlcal Hints onMounting," 6d. 



Mason's " S. W." Series Mounted Speeimens for Students, 



12 objects in handsome case, lying flat, 10/6, cheapest and best. 



R. G. MASON (jar.1'wift), 69 Park Bd.. Clapham, S.W. 

 MICRO-PETROL OGY. 



A MOUNTED SECTION OF LLANYNYNECH LIMESTONE, 



CONTAINING UNIQUE FOSSIL REMAINS, 



Post free, Is. 4d. 



6 UNMOUNTED ROCK SECTIONS, Illustrating Crystalline, 



Vitreous and Altered Eruptive Rocks. 



See Rutley's " Studies of Rocks." 



With Full Instructions for Mounting, 3s. 3d. 



MASON. 69 PARK ROAD, CLAPHAM, S.W. 



APPARATUS ^H^ COMING SEASON. 



Write for Illustrated Catalogue to 



W. F. H. ROSENBERG, F.Z.S., 



Naturalist, 

 48.i Charing Cross Road, London, W.C. 



Try tlie " MATADOR" VovAi-! (registered), the best preserva- 

 tive against Mites, Moth, Dermestes, &c. 



Price 3d. per- oz., ».s. 4<». per lb., post free. 



!*" All species mentioned in Dr. Lang's Palaearctic Butterflies 

 Articles in Science-Gossip either kept in stock or obtained if possible. 



MICROSCOPICAL. 



Unmounted Material, in fair quantity, 6d. per packet of 

 12 objects. 



Mounted Insect Dissections, in new medium, without 

 pressure, is. per slide, post free. 



LISTS FREE. APPROVAL. 



FRANK P. SMITH, 



IS Cloudesley Place, Islington, London, N. 



LIVING SPECIMENS FOR 

 THE MICROSCOPE. 



Volvox, Spirpgyra, Desmids, Diatoms, Amoeba, Arcella, Actino- 

 sphaerium, Vorticella, Stentor, Hydra, Floscularia, Stephanoceros, 

 Melicerta, and many other Specimens of Pond Life. Price is. per 

 Tube. Post Free. Heli,\ pomatia, Astacus, Amphioxus, Rana, 

 Anodon, &c., for Dissection purposes. 



25 BALSALL HEATH ROAD, BIRMINGHAM, 



MARINE BIOLOGICAL ASSOCIATION OF 

 THE UNITED KINGDOm. 



THE LABORATORY, PLYMOUTH. 



The following Animals can always be supplied either living or 

 preserved by the best methods : — 



Sycon ; Clava, Obelia, Sertularia ; Actinia, Tealia, Caryophyllia, 

 Alcynnium ; Hormiphoria (preserved) ; Leptoplana ; Lineus, 

 Amphiporus ; Nereis Aphrodite, Arenicola, Lanice, Terebella ; 

 Lepas, Balanus, Gammarus, Ligia, Mysjs, Nebalia, Carcinus ; 

 Patella, Buccinum, Eledone, Pecten ; Bugula, Crisia, Perdicellina ; 

 Holothuria, Asterias, Echinus; Ascidia Salpa (preserved), Scyllium, 

 Raia, etc., etc. For Prices and more detailed Lists apply to 



The Director, Biological Laboratory, Plymouth. 



BECK'S 



NEW "BRITISH 

 STUDENTS' " 



MICROSCOPES, 



No. 54.- Stand, Iris diaphragm 

 and mahogany case, 



£2 lis. 6d. 



N 

 Full Prices ami Partii:ula> i 

 on application to 



No. 55.- Stand, Iris diaphragm No. 56.— Stand, Iris diaphragm No. 57.- Stand, Iris diaphragm 

 and mahogany case, and mahogany case, and mahogany case, 



£3 12s. 6d. £4 7s* 6d. £5 12s. 6d. 



One-twelfth Inch Oil Im.mersion Object Glass, N'A I'o £,'^. 



R. & J. BECK, Ltd., 68 Cornhill, London, E.G. 



