p 



Sept. 1 8, 1879] 



NATURE 



clxix 



BARCLAY & SON, 



138, REGENT STREET, LONDON. 

 To Her Majesty and H.R.H. the Prince of Wales. 



DUPLEX LAMPS. 

 MODERATOR LAMPS. 



READING LAMPS. 



MICROSCOPE LAMPS. 



BEST COLZA OIL. 



A I KEROSINE OIL. 



WAX, SPERM, 



PARAFFINE CANDLES. 



.0 



/--■ 



ILLUSTRATED CATALOGUES POST FREE. 



"Micros copic objectsT 



Horn Sections, Blood Discs, Feathers, Hairs, Sections of Bone and Teeth, 

 Fish Scales, Anatomical Preparations from the Human Subject and Lower 

 Animals, Palates of Moliusca, Sections of Shells and Pearls, Polyzoa, whole 

 Insects, Parasites, parts of Insects, Ossicula, Spines, &c., of Echinoder- 

 niata, Spicules of Sponges and Gorgonias, Foraminifera, Botanical Prepara- 

 tions, Diatomaccsc, Salti, CrysfUs, Sections of Rocks, Fossils, Minerals, 

 &c, 



Ochreoui Iron in Moss-like Forms in Calcite, is. 6J. post-free. 



SteUar Mica, or Canadian Phlogopite, u. 3d. post-free. 



Catalogues free. 



THOS. D. RUSSELL, 



4S, ESSEX STREET, STRAND, LONDON, W.C. 



BRITISH ASSOCIATION, 1879. 



CASTLETON, NEAi: SHEFFIELD. 



_ The district of which Castleton is the centre is one of the most romantic 

 in the Peak. The Peveril Castle, the Peak Cavern, the " Shivering Moun- 

 t»m," Mam Tor, the Pass of the Winnatts, and many other glens, caverns, 

 ard hills, with the ossiferous caves, present varied objects of interest. Mr. 

 John Tym (who is Assistant Curator of the Castleton Museum, the property 

 of Rookc Pennington, Esq.) has a great number of the fossils and minerals 

 from the locality on sale (mcludmg teeth, &c , of the pleistocene mammalia), 

 a.'id has also a most extensive collection of geological specimens from all 

 pans of the world. Members of the Association will find his stock well- 

 wonli a visit and his prices very reasonable. 



Catalogues Post-free. 



c. 



ADVERTISING. 

 H. MAY 8c CO., 



GENERAL ADVERTISING OFFICES, 

 78, GRACECHURCH STREET, LONDON, E.G. 



(The only Address.) 

 ESTABLISHED 1846. 

 Advertisements ef every description received for insertion in all News- 

 ipcrs. Magazines, Reviews, &c., at the same rales al at the ofKces of the 

 tpers. 



Estimates for General Advertising. Reduction for a series. 

 Liberal terms to large advertisers. 



Advertisements are also received for all newspapers, which may be ad- 

 essed to these Offices, without extra charge, and replies forwarded, if 

 quired. 



C H. MAY & CO., having special communication with the leading news- 

 ;pers three times daily, can guarantee the utmost promptitude and correct- 

 ness of insertion to all Advertisements entrusted to them. 

 The Press Manual for 1879, containing a complete List of Newspapers 

 published in the United Kingdom. Post free, 6d. 



Now ready, a Revised Edition. 



NEGRETT! & ZAMBRA'S 



ENCYCLOPEDIC 



Illustrated and Descriptive 

 CATALOGUE OF 



SCIENTIFIC INSTRUMENTS. 



(Containing very numerous Comparative Tables of Reference and 



Illustrated by upwards of TWELVE HUNDRED ENGRAVINGS, 



Six Hundred Pages, Royal 8vo, cloth, gilt lettered. Price ss. 6if.) 



OFlical, Mathematical, Philosophical, Photographic, 



AND 



STANDARD METEOROLOGICAL 

 INSTRUMENTS. 



MANUF.\CTURKD AND SOLD BY 



NEGRETTl AND ZAMBRA, 



opticians and Scientific Instrument Makers to 



The RoyalObservatory, Greenwich; the Admiralty; Hon. Board of Ordnance: 



Board of Trade ; ihe British Meteorological Society ; the Observatories 



Kew, Toronto, Washington, Victoria ; East Indian Government. 



HOLBORN VIADUCT, E.C, 



ALSO AT 



45, CORNHILL, E.G., & 122, REGENT STREET, W., 

 LONDON. 



MINERALS, ROCKS, AND FOSSILS. 



COLLECTIONS IN CABINETS. 



Two Hundred Specimens, 40J. ; 150 do., 30J. ; 100 do., aof. ; 50 do., loj. 

 Size of Specimens. 2 square inches. Naming and Localities guaranteed. 



Superior Cabinets fitted with Card-Trays and Catalogue included. 



" The Popular Scientific Pocket Cabinet Series *' comprif^es o Cabinets and 

 224 Specimens, is. 6d. each Cabinet, free delivery, 14. (See Nature, 

 March 13, No. 489. page 447.) 



The Collector's Field Apjiaratus complete, 11s. Hammer-holder and 

 WaLst-strap, price 2J. Collecting-bag (figured and described), price 4J. 



THOMAS J. DOWNING, Geologist, &c., 



33, WHISKIN STREET, LONDON. E.C. 



Catalogue, Lists, and " Quarterly Circular " free on receipt of a//, postage. 



MICROSCOPIC OBJECTS 



Of superlative perfection, illuitrating Histology and every branch of Micro- 

 scopy. Catalogue post free and gratis on application. 



PARIS UNIVERSAL EXHIBITION, 1878. 



Prite Medal awarded for Excellence, Variety, &r'c. 

 EDMUND WHEELER, 48N, ToIIington Road, Holloway, London, N. 



EAGLE INSURANCE COMPANY^ 



79, PALL MALL. 



For Lives only. Established 1807. 



Net Premiums and Interest .« ». ... m. ». ». ^£396,818 



Accumulated Funds «,««,«..„«. ;£3,o83,28i 



Also a Subscribed Capital of more than ... .« ,Ci, 500,000 



Reports, Prospectuses, and Forms may be had at the OflSce, or from any 

 af the Company s Agents, post free. 



GEORGE HUMPHREYS, Actuary and Secretary. 



ELECTRICAL and SCIENTIFIC APPA- 



RATUS. — MICROPHONES and HUGHES' SONOMETER. 

 ELECTRIC BELLS, INDICATORS, Fire- and Thief-Alarms. New 

 Constant Batteries, INDUCTION-COILS and I'KICTIONAL 

 MACHINES. Magnets, Insulated Wires, Screws, arid all materials. 

 Liberal Tekms to Schools and Science Teaciiehs. Apparatus 

 on hire. Complete Electric Catalogue, 2 stamps. Optical and Photo- 

 graphic List, r stamp.— DALE and CKAMPTON, Manufacturing 

 Electricians, 4, Little Britain, London, E.C. 



DIAMONDS IN MATRIX. 



R. C. NOCKOLD, Diamond and Oricnlal Stone Cutter mi Dealer, hat 

 for sale specimens of the above ; also Cut Precious St.nes in all Colours. 



u, FRITH STREET, SOHO, W. 



