Oct. 30, 1879] 



NATURE 



CCXIX 



OROIDE GOLD JEWELLERY. 



(REGISTERED.) 



(REGISTERED.) 



The only Perfect Substitute for 18-Carat Gold. 



ILLUSTRATED PRICE-LISTS POST-FREE. 

 MAGNETIC COMPASS CHARMS, 



For Appendages to Watch-Chains, combining a reliable Compass, Magnifier, and Burning-glass ; 

 best quality, and in fine gold patterns, 8s. 6d. and \os. 6d. Free per registered post. 



WATCHES. 



The Cases of these are very handsome and in exact representation of those of the best-made 18- 



carat Watches ; the movements are thoro;jghly reliable, and constructed to perform for at least 



twenty-five years. Open face, from 21s. Hunters, from 30^. Per registered post, (>d. extra. 



ALBERT CHAINS, 



Perfect in finish, and embracing all the best i8-carat gold designs, lor. 6d, ; smaller patterns, 5J. 



and 7.1. 6d. Post-free. 



F. 0. 0. payable at Exhibition Road^ South Kensington. 



C. C. ROWE, 88, BROMPTON ROAD, LONDON^ 



PATERSON'S\APPARATUS FOR LECTURES AND SCIENCE CLASSES. 



New List of APPARATUS, LANTERNS, and LANTERN SLIDES for SCIENTIFIC LECTURES, with Terms o£ Hire. Post free. 

 Complete Sets of Physical Apparatus for Science Primers and all the Physical Text-books in use in Schools and Colleges. 

 Siemens and GrammeDynamo Machines and Lamps for hire. _ . , c- • ryi. ti .c j j ui _• •.. 



Schools supplied with Apparatus as per Science and Art Departments Requirements in the Sections of Light, Heat, Sound, and Electncjty. 

 Electric Signals for Houses, Hotels, &c., Colliery Signals, Lightning Conductors, Gower and other Patent Telephones. 



EDWARD PATERSOfSI, 



ELECTRICAL ENGINEER AND SCIENTIFIC APPARATUS MANUFACTURER, 



3, BEUfORU COURT, COVENT GARDEN, LONDON. STEAM WORKS-GRAY'S INN ROAD. 



Illustrated Catalogue of Electrical Apparatus, Part I, post free, 6 Stamps. Ditto, Electric Signals, Part 2, post free, 6 Stamp. 



W. LADD 8c CO., 



SCIENTIFIC INSTRUMENT MANUFACTURERS 



(By Appointment to the Royal Institution of Great Britain), 



II AND 12, BEAK STREET, REGENT- STREET, W. 



IMPROVED HOLTZ ELECTRICAL MACHINES, with 4 to 24 Plates. Immediately available in any condition of the atmosphere. 



LADD S DYNAMO-MAGNETO MACHINE and GRAMME'S MAGNETO-ELECTRIC MACHINE for Laboratory use. 



Physical Apparatus of every Description. 

 ILLUSTRATED CATALOGUE, SIXPENCE. 



W. F. STANLEY, 



Mathematical Instrument Manufacturer 



To H.M.'s Government, Council of India, Science and Art 

 Department, Admiralty, &c. 



Mathematical. Drawing, and Surveying Instruments of every description, 06 

 the highest quality and finish, at the most moderate prices. 



Price List post free. Engine Divider to the Trade. 

 ADDRESS- 

 GREAT TURNSTILE, HOLBORN, LONDON, W.C. 



L'^LEGTRIGITfi 



Re'vue aclentlflque lllustree 



Paraissant le 5 at le 20 da chaqua moia 

 £n unebelte Uvraison de vingt-quatre pages grandinSo litu$ 



T^Mgraphie. — Oalvanoplastie. — Mettorologie. — M^deciua 

 Art militaire. — Applications diversea 



OROANB SPl^ClAL DBS PROQR&S DB LA LUMlfiRB ^LBCTRIQIJB 



Publication r^dig^e depuis 1876 aveo la coUaboratioodea 

 principaux ^lectriciens fran^ais et strangers. 



Sacritairei do la Redaction : W. dk Fonvielle et le C* d'Abko*. 

 Uirecteur : E. de Clision. 



CONDITIONS D'ABO.\NEiIENT : 



PARlSETD£PARTEl«ENTS;J«°„v; "g bSI""""" POSULEJ* i°'^; '* jj 



ETATS-UNIS D'AMEHIOUE.!! '°V 'J » 

 " Jo moifl. o • 



Prix d'une livraison : • 76 



IM numiro tpMmen at envoys gralii tur toute dwmmndt ufframtkia 



adrcKi^e «u bureau du Journal : 



Paris, 16. rue da Croissant. Paris. 



The MORPHOLOGY of the SKULL. By 



W. K. PARKER, F.R.S., Hunterian Professor, Royal College of 

 Surgeons, and G. T. BETPANY, B.Sc, Lecturer on Botany in Guy's 

 Hospital Medical School. Illustrated. Crown 8vo. los. 6rf, 

 MACMILLAN & CO.. London. 



FRYS 



GOLD MEDAL, 

 PARIS EXHIBITION. 



^^ ^^ ^^ ^^ fk In Packets and Tins. Pur« 



f V J I Kj ^X Cocoa only, with the super- 



fluous oil extracted. 



EXTRACT 



** If properly prepared, there is no nicer 

 or more wholesome preparation of 

 cocoa." — Focdt Water^ and Air^ 

 ediUd by Dr. Hassall. 



J, S. FRY & SONS, Bristol and London. 



JOHN NORMAN, 



MANUFACTURER OF 



MICROSCOPES, OBJECTS, CABINETS^ 



TABLES, LAMPS, 



And all Class Appliances for Microscopes, 



HAS OPENED NEW AND EXTENSIVE PREMISES AT 



34, Whitecross Street, Cripplegate, E.C. 



Lists post free on application. 

 Od the ist ot every Month, price Sixpence. 



THE ENTOMOLOGIST: 



AN ILLUSTRATED JOURNAL OF BRITISH ENTOMOLOGY. 

 Edited by John T. Carrington, 

 With the Astittaace of 

 Frederick Bond, F.Z.S. I John A. Power, M.D. 



Edward A. Fitch, F.L.S. | J. Jenner Weir, F.L.S. 

 F. Buchanan White, M.D. 

 The Entomologilt was founded lor the purpose of diffusing mformatlOD 

 with regard to the science generally, and especially respecting Insects in- 

 jurious to Farm or Garden ; for Recording the Capture of Ranlies ; and 

 for Figuring Varieties. Monthly LisO of Duplicates and DesideraU ar. 

 published. . . . , ,. , _• . 



Interesting articles on all branches of the science by leading entomologist*. 

 Especial attention is given to the printing of the Woodcut Illustratiohs,. 

 which are numerous. There are occasionally Coix)Uriid Plates. 



SIMPKIN, MARSHALL, and CO., Sutioners' HaU Court. 



