October 19, 1905] 



NA TURE 



ccxlix 



Sale b^ auction. 



COLLECTION' OF BRITISH LEPIDOPTERA FORMED BV 

 GEORGE O. DAY, Esij., F.E.S. 



MR. J. C. STEVENS will Offer, at his 



Rooms, 3S King Street, Covent Garden, Lontion, W.C . on TUES- 

 DAY. October -4, at half-past 12 o'clock, the COLLECTION of 

 BRITISH LEPIDOPTERA formed by GEORGE O. DAY, Esq., 

 F.E.S. , of Knittsfoid, comprising long Series in fine fresh condition, 

 the majority of the Insects being modern and labelled, together with 

 the four Cabinets in which they are contained. 

 On view d,ay prior 10 to 4, and morning of sale Catalogues on 

 application. ^^ ^ I 



MINERALS, ROCKS, FOSSILS. 



A large stock of BRITISH AND FOREIGN MINERALS always on view. 



A SPECIALIl Y. 

 Special displayfor Teachers an.< Students on Saturdays. Open till 7 p.m. 



RICHARDS' SHOW ROOMS. 



3 Beaiichamp Place, Brompton Road, South Kensington, 

 London, S.W. 



MIOROSGOPIGAL PETROGRAPHY. 



Gentlemen interested in the above study are invited to send to 



JAMES R. QREQORY & CO., 



I Kelso Place, Kensington Court, London, W., 



for a Prospectus of 



THE TWENTIETH CENTURY ATLAS OF 



MICROSCOPICAL PETROGRAPHY, 



now being issued in Twelve Monthly Parts, each Part containing Four Fine 

 Half Tone Plates, and also Four actual Rock Sections. 



Subscription in advance, either Monthly, 7/-; Quarterly, 21/-, 

 or for the whole Series of 1 2 Monthly Parts & 48 Sections, £4 4s. 



LIVING SPECIMENS FOR 

 THE MICROSCOPE. 



Volvox, Spirogyra, Desmids, Diatoms, Amoeba, Arcella, Actmosphaerium, 

 Vorticella, Stentor, Hydra, Floscularia, Siephanoceros, Melicerta, and many 

 other specimens of Pond Life. Price rj. per Tube, Post Free. Helix 

 pomatia, Astacus, Amphioxus, Rana, Anodon, &c., for Dissection purposes. 



THOMAS BOLTON, 



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, Alcy- 

 onium ; Hormiphora (preserved) ; Leptoplana ; Lineus, Ampbiporus, 

 Nereis, .Aphrodite, Arenicola. Lanice, Terebella ; Lepas, Balanus, 

 Gammarus, Ligia Mysis, Nebalia, Carcinus ; Patella, Buccinum, Eledone. 



THE NEW COLLECTION OF 



336 SPECIMENS AND SLIDES OF ROCKS, 



according to H. ROSENBUSCH : " Elemente der 

 Gesteinslehre, 2d ed. 1901." 



Accompanied by a te.xt-book : " Praclual rctrography," giving a short 

 descriptiori of the polarising microscope and its application, and also of the 

 macroscopical and microscopical features of every specimen of this coliec- 

 ■'--- by Professor Dr. K. Busz of the University of Miinster. This 



:s, and contains typical 

 posed of 



collection is intended for the practical use of studen 

 representatives of all important types of rocks; it 

 rocks (qj deep-seated rocks, 50 dike rocks, 

 lentary, and 31 crystalline schists. Out of 



of 250 and 165 specir 

 Collection I. 



336 Specimens of Rocks 



336 Slides 



250 Specimens of Rocks 

 250 Slides 



165 Specimens of Rocks 

 165 Slides 



133 volcanic rocks), 

 D smalUr collections 

 es are as follows :— 



380 Marks. ■ 



420 



270 



310 



170 



205 



COLLECTIONS OF MINERALS, FOSSILS, METEORITES^ 

 PURCHASED FOR CASH OR EXCHANCEO. 



The fifth edition of Catalogue No. 4, Petrography, has just 

 been published (210 pages), and will be sent free of charge on 

 application. 



Dr. F. KRANTZ, 



RHENISH MINERAL OFFICE, BONN-ON-RHINE, GERMANY. 



ESTABLISHED 1S33. 



Pectens Bugula, Crisia, Pedicellin, 

 Ascidia, Salpa (preserved), Scyllium, Ra 

 For prices and more detailed lists apply 

 Biological Laboratory, Plymouth. 



Holothu 



&c., &c. 



Echii 



THE DIRECTOR. 



BIRKBECK BANK 



ESTABLISHED 1851. 

 Current Accounts. 2% Interest allowed on minimum 



monthly balances when not drawn below {,100. 

 Deposits. 2^% Interest allowed on Deposit Accounts. 

 Advances made. Stocks and Shares bought and sold 

 Apply C. F. Ravenscroft, Secretary, 



Southampton Buildings, High Holborn, W.C. 



WATKINS & DONCASTER. 



Naturalists and Manufacturers of 



CABINETS AND APPARATUS 



SPECIAL SHOW-ROOM FOR CABINETS. 



N, B.— For Excellence and Superiority of Cabinets and Apparatus, refer- 

 ences are permitted to distinguished patrons, Museums, Colleges, &c. 

 A LARGE STOCK OF INSECTS. BIRDS' EUQS AND SKINS. 



SPECIALITY Objects for Nature Study, Drawing 



Classes, &c. 



Birds, Mammals. &c.. Preserved and Mounted by First-class 



Workmen true to Nature. 



All Books and Publications on Natural History supplied. 



36 strand.Hlondon, W.C. 



(Five Doors from Charing Cross.) 

 |«- Nvu' Catalogue {103 pp.) Just issued, 2>ost free. 



Colleetions and Sing-le Specimens of 

 British and Foreign 



MINERALS, ROCKS, FOSSILS. 



25 Specimens, 5/6; 50 do., 10/6; 100 do., 21/-; 200 do., 42/-. 



20 Coal Measure Rocks and Fossils, 12/6 ; do., larger, 15/- 



In Polished Deal Boxes. 



Cabinets, Geologists' Hammers, Card Trays, Glass-Capped Boxes, 



Models of Crystals, and other Apparatus for Geologists, &c. 



NEW CATALOGUES POST FREE. 



THOMAS D. RUSSELL, 78 Newgate St., London, E.G. 



NOTICE. — Advertisements and business letters for Nature should be addressed to the Publishers ; Editorial 

 Communications to the Editor. The telegraphic address 0/ Nature is " Phusis," London. 



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