SCIENCE-GOSSIP. 



WATSON & SON'S NEW MICROSCOPES & APPARATUS. 



WATSON'S Xew Parachromatic Oil Immersion Con- £> s. d. 



denser. i'3o N.A.. aplanatic Aperture, 1*25 N.A., 



undoubtedly the best condenser yet produced for 



high-power work. Complete with Iris mount 6 10 



Optical part only 500 



WEST'S Table' Stage, as described in "Microscopy" 



column. Science-Gossip, June, 1S99 17 6 



WATSON'S Van Heurck Microscope 



WATSON'S Edinburgh Student's Microscope . . 



WATSON'S " Fram "' Microscope 



For Field AVork : 



BOTANY.— Very strong Digger with leather cover .. 3 

 Field Books, with thick bibulous pads, wooden 



boards and straps -. -. -■ 029 



Vasculum, Japanned tin, with shoulder straps 



2 sizes, each 3s. and 3 6 

 GEOLOGY.— Geological Hammers ..2s. 6d. and 3 6 



Watson's Illustrated Catalogue of MIscroscopes (No. 2), containing full particulars of the above, forwarded post free on application. 

 Watson's CatalOJiue (No. 3), is a Classified List representing a stock oi over 40,000 first-class specimens. Post free on application. 



"W. WATSON & SONS, (Sstablisbct IS37), Opticians to H.IM. Government, 

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New Branch Now Open: 16. FORREST ROAD. EDINBURGH. And at 78. Swanston Street. Melbourne, Australia. 

 A-Marded JQ Gold and other Mcdah at the principal hiiersiational Exhibitions of tJic World. 



Micro: Objects: £, s. d. 



Anatomy of a Leaf (9 pieces), arranged on one slide . . 2 6 

 Section throug^h entire Bud of Lily, showing ovary, 



anthers, petals, pollen grains, &c. . . 2 

 Set of 24 Botanical Slides (elementary tissues), specially " 



arranged for the use of students, in case . . 14 



Set of 12 Slides, illustrating structure of Typical Rocks 18 ' 



Ditto ditto Physiography' .. 14 6 

 Genus Diatomaceffi Slides, consisting of several species 

 of one genua — 



Navicula, 100 species, 7s. 6d. ; Aulacodiscus, 25 species 12 6 



Pleurosigma . . 50 species, 15s. ; Surirella. 50 ,, 7 6' 



Coscinodiscus, 100 species, 7s. Gd.; Triceratium,5o ,, 7 6 



METAMORPHOSES.— Actual specimens arranged and labelled 



in museum jars to illustrate life histories. List of subjects on ' 



application. 



MINERALS, ORES, ROCKS, 

 FOSSILS, &c. 



" what they aro." and " Where they are found. 

 In this " Elemenlan' GeoloRical Series " are five sets, each set 

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notes. In cases 11 x 7 x li, postjrec, 3s. 



SET No. 26. —" Metallic Mhiirah." contains 20 named Sjieci- 



mens of Metallic .Minerals and Ores, in which the principal 



i^roups are represented, including Ores of copper, iron, leads 



zinc, tin, &c. .. .. .. .. -■ 2s. 6d. 



SET No. 27.— " Earthy . jMinerals." contains 20 named Speci- 

 mens of Earthy .Minerals, including Fluor, Apatite, Felspar, 

 Talc, Hornblende, &c. . . . . . . 2s. 6d. 



SET No. 28. —" fzneojis Rocks, " contains 20 named Specimens 

 nf Ijineous, Volcanic, and .Metamorpliic Rocks, including; 

 Obsidian. Trachyte, Granite, Lava, Basalt, &c. . . 2?. 6d. 



SETJ^o. 29.^ " Sediwex/ary Jiocks" contains 20 named Speci- 

 mens of- Sedimentary Rocks, including Crag. Gault. Oolite, 

 Lias. Limestone, Sandstone, &c. . . . . 2s. 6d. 



SET No. ZO.— " Fossih." contains 20 named Specimens of 

 British and i.tlier Fossils, including examples from Crag, 

 I'Xicene, Gault, Oolite, Carboniferous, &c. . . 2s. 6d. 



The air^'e 100 Specimens of Minerals, fast /ree, 12s. 6d. 

 SET No. \5S.— " Prcciotis Stoiu-s," contains 20 well-known 

 examples of stones m use tor jewellery and ornamentation, as 

 found in nature, from various parts of the world, with their 

 specific localities, &c. 5s. Od.. or post free. 5s. 6d. 



See Editorial yoticc. January Xo. of Scx^^C-e.-COf.sn:' 

 and -write for full Cataleigue postjrce. 



COX & CO., 99 & 1 OIJEUV OXFORD ST., LONDON, 



Second Volume Xov.' Ready. 



APPLIED GEOLOGY. 



Complete Work 7s. 6d. Post Free. 



By J. V. ELSDEN, B.Sc. (London), F.G.S. 



Demy Svo, bcaind in clolli. Profusely illustrated. 



■I 



THE QUARRY PUBLISHING CO., LTD. 



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W. F. H. ROSENBERG, 



i-i'avcllcr='(HaturaU5t, 



48a, CHARING CROSS ROAD, LONDON, W,C, 



Every dlescription of Natural History Apparatus. 



CDC 3POUJ19 Collector's Outfit, 



CONT.ilXING 

 Butterfly Net. Pocket Box. Relaxing Box, Larva Box. Three 

 Setting^ Boards (various sizes). Store Box, ^lixed Pin^i, Killing- 

 Bottle. Setting Needle, Clip Bo.xes, Blow-pipe and Egg- Drill. 



Price, 10s. 6d. complete. niustraUd Catalo-.juc o/ Jf^aratnspost rr-:c. 



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MICROSCOPES. 



No. ^5.— Stand Ir.s diaphragm Xo. 36.— Stand, Iris diaphra.am No. 57.— Stand. Iris diaphragm 

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£3 I2S. '6d. i'4 7s. 6d. i5 lis. 6d. 



New One-twelfth I.nch Oil Immersion Object Glass. N'A fO £4. 



Eun Prices and Mrticniars ^ ^ J BECK, Ltd., 68, ComhiU, Londoii, E.G. 



on application ta ^^* ^-'*-' j* 7 f 7 j 7 



1, :i-,;ii.'J, Irs di.iplirngm 

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