July lo, 1879 I 



NATURE 



Ixxxiil' 



LIBRARY OF HARVARD UNIVERSITY, 

 CAMBRIDGE, MASS., U.S.A. 



AuJtages for the General Library, or for any of the Departmental 

 libraries (Astronomical Obsenatory, Botanic Garden, Eussey Institution, 

 Divinity School, Law School, Museum of Comparative Zoology, Scienti6c 

 $j^ool), may be sent to the Agents, Messrs. TkCbner & Co., 57 and 59, 

 Ladeate Uili, London. 



JUSTIN WINSOR. Librarian. 



DUNHEVED COLLEGE (LIMITED), 



LAUNCESTON, CORNWALL. 

 Seren hours from London. Separate Bedrooms. Systematic Teaching 

 in Science, Foreign Languages, and University Courses. 

 Calendar post free from 



The Principal— benjamin RALPH, LL.B. Dub. 



ROYAL POLYTECHNIC— CLASSES for 



the preparation of Students for University Examinations, under the 

 direction of EDWARD B. AVELING, D.Sc, F.L.S. London Uni- 

 Tersity Matriculation, ist and and B.Sc., Preliminary Scientific M.B., 

 Botany, Physiology, Chemistry. All the work practical. 



to be let, FURNISHED, a Comfortable 



HOUSE, about thirty miles from London, with large old-fashioned 

 Garden and Meadow, the Garden well stocked wiih Flowers, Fruit 

 Trees, and Vegetables. Two good Sitting-rooms five Bed-rooms, and 

 Offices. Suitable for a family wishing to spend a few months in the 

 country. Terms moderate. — Apply X!V., care of Nature Office, 29, 

 Bedford Street, Strand. 



MINERALOGY AND GEOLOGY. 



A New List of Collections of Fossils, Minerals, and Rocks now ready, 

 including Special Collections to illustrate the various Text-books, in 

 Cabinets. List of Sections of Rocks for the Microscope. Blowpipe Appa- 

 ratus and Materials of all kinds in Cases or separately. New Patterns of 

 Geological Hammers, with prices. List of N«w and Second-hand Books of 

 JAMES R. GREGORY, 

 MUSEUM OF GEOLOGY. 



88, CHARLOTTE STREET, FITZROY SQUARE. 



CASTLETON, DERBYSHIRE. 

 JOHN TYM 



Has largely added to his stock of Fossils and Minerals, and is now offering 

 greatly improved Educational Collections at very Low Prices. 



For full particulars see his Catalogue, sent post free on application. 



Postal Address— 



CASTLETON vid SHEFFIELD. 



MINERALS, ROCKS, AND FOSSILS. 



COLLECTIONS IX CABINETS. 



Two H\mdred Specimens, 40^. ; 150 do., 30^. ; 100 do., %:>s. ; 50 do.. lof. 

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



Superior Cabinets fitted with Card-Trays and Catalogue included. 



" '1 he Popular Scientific Pocket Cabinet Series " comprises 9 Cabinets and 

 ax4 SpKiciinens. aj. td. each Cabinet, free delivery, 4^. (See Nature, 

 March 13. No. 489. page 447.) 



The Collector's Field Apparatus complete, 21J. Hammer-holder and 

 Waist-strap, price zs. Collecting-bag (figured a,nd described), price 4J. 



THOMAS J. DOWNING, Geologist, &c., 



38, WHSKIIN STREET, LONDON, E.C. 



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



FOREIGN BOOKS AT FOREIGN PRICES. 



WILLIAMS & NORGATE'S NATURAL 



.SCIENCE CATALOGUE. A List of Works on Astronomy, Meteoro- 

 I'»gy. Physics, Electricity, Chemistry, Microscopy, Optics, Mechanics, 

 Engineering, Technology, &c. Sent post free on application. 



WILLIAMS & NORGATE'S NATURAL 



HISTORY CATALOGUE. A Classified List of Books on Natural 

 History, Zoology, Anthropology, Physiology*, Botany, Geology, Palae- 

 ontology, &c. bent post jree on application. 

 T4, Henrietta Street, Corent Garden, London ; and 20, South Frederick 

 Sueet, Edinburgh. 



NEW VIEWS of MATTER, LIFE, Mo- 

 tion, and RESISTANCE. By JOSEPH HANDS, M.R.CS., &c., 

 &c. Price td. monthly. 



E. W. ALLEN, If, Surionen' Hall Court, E.C. 



GARDENING ILLUSTRATED: a new 



Weekly Journal for all interested in Gardening in Town or Country. 

 Price \d. weekly. Profusely Illustrated. Flowers, Fruits, Vegetables, 

 ToMTi and Suburban Gardening, Villa Gardening, the Cottage Garden, 

 Window Gardening, Work in the Garden for every week. May be had 

 of all Newsagents and at the Book-*taIls, \d, every Saturday. Post free 

 for twelve months for 6j 6rf. Specimen copy, \\d. in st.amps. Office, 

 37, SsuthampCon Street, Covent Garden, London, W.C. %■ 



.#aU bg aiuction. 



IMPORTANT SALE OF PHOTOGRAPHIC APPARATUS. 



MR. J. C. STEVENS has received. Instruc- 

 tions from MR. SOLOMONS, of Red Lion Square, to off^r for Sale 

 by Auction at his Great Rooms, 38, King Street, Covent Garden, on 

 SVednesday and Thursday, 23rd and 24th of July, at half past 12 p<e- 

 cisely each day. the entire stock of Photographic and Optical goodjL 

 Further particulars in future advertisement. 

 On view the day prior ani mirn.ngs of Sale, and Catalog, es had. 



ELEMENTARY COLLECTIONS. 



Mr. BRYCE-WRIGHT begs to call attention to his Series of 



ELEMENTARY COLLECTIONS 



illustrating the Sciences of MINERALOGY, GEOLOGY, and PETRO- 

 LOGY. Prices, ;Ci toi;25. 



N.B.— These Collections obtained the only PRIZE MED.\L at the Ex- 

 hibitions of 1862 and 1867 (Paris). 



Nevt Illustrated Catalogue, is. 2d. 



BRYCE-WRIGHT, 



MINERALOGIST, GEOLOGIST, &c. 



90, GREAT RUSSELL STREET, BLOOMSBURY, 



LONDON, W.C. 



NOTICE OF REMOVAL. 



JAMES HOW & CO, 



SCIENTIFIC INSTRUMENT MAKERS, 



73, FARRINGDON ST., LONDON 



(Late of 5, St. Bride St., and 2, Foster Lane). 



HOW'S STUDENT'S MICROSCOPE. HOW'S MICROSCOPE LAMP. 



Rock Sections and other Objects for the Microscope. 



eagle INSURANCE COMPANY, 



79, PALL MALL. 

 For Lives onlv. Established 1807. 

 Net Premiums and Interest ». »* ... ». ••* *» jC3g6,8]8 

 Accumulated Funds ... ». .» ... .« .» ... .m ;f 3,083,381 



Also a Subscribed Capital of more than ... .» ,£1,500,000 



Reporu, Prospectuses, and Forms may be had at the Office, or from any 

 of the Company 5 Agents, post free. 



GEORGE HUMPHREYS, Actuary and Secretary. 



HOBNE'S FOMPEIAN DECORATIONS. 



ROBERT HORNE, 



HOUSE DECORATOR and PAPER-HANGING 



MANUFACTURER, 



41, GRACECHURCH STREET, LONDON, E.C. 



By Special Appointment to His Majesty the KinK of Italy. 



COMPLETE SET of NATURE to MAY, 



1879. 19 Vols., cloth, £s 151. 



GRATIS to BOOK-LOVERS. — General 



Catalogue, eighty p.-iges, octavo, comprising Scientific Works, French 

 and Italian Literature, selected English Literature, &:c. 



WILLIAM GEORGE, xxvi. Park Street, Bristol. 

 NOTICE TO ANTIQUARIANS.— "BibliothecaAntiqua et Curioia"" 

 it tui included in above list, but forms sixty-four pages, octavo, and wilt 

 be forwarded at request 



NOW^ READY, 

 SECOND EDITION, 



G R I F F I N'S 



CHEMICAL HANDICRAFT. 



PRICE AS. jd. POST FREE. 



A CATALOGUE OF CHEMICAL APPARATUS; 



ILLUSTRATED, CLASSIFIED, DESCRIPTIVE. 



Demy 8vo, 480 pp.. Illustrated with 1,600 Woodcuts. 



Most Complete and Cheapest List of Apparatus, 



JOHN J. GRIFFIN and SON.S, 22, GARRICK STREET, 

 LONDON, W.C. 



