August 21, 1879] 



NATURE 



CXXXl 



As FACTOR or STEWARD of Estates, a 



Practical and Energetic Man, highly recommended, can superintend 

 building, drainage, road-making, cutting down, converting, and mea- 

 suring of timber, ic. Wife understands dairy and poultry. Address 

 C. L., care of Messrs. Macmillan and Co., 19 and 30, Bedford Street, 

 Strand. 



LIBRARY OF HARVARD UNIVERSITY, 

 CAMBRIDGE, MASS., U.S.A. 



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

 libraries (Astronomical Obsenatory, Botanic Garden, Eusscy Institution, 

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

 School), may be sent to the Agents, Messrs. TrCbner & Co., 57 and 59, 

 Ludeate Hill, London. 



fUSTIN WINSOR, Ubrariao. 



EQUATORIAL TELESCOPE for SALE, 



vcrj' cheap. — 3* object-glass, several eye-pieces, finder, rackwork stand, 

 unusually strong, perfect condition. — Address Astra, care of the Pub- 

 lishers of Natl'ke. 20, Bedford Street, Strand, W.C. 



TO BE LET, FURNISHED, a Comfortable 



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

 Gardea and Mcaduw, the Garden well stocked with Flowers, Fruit 

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

 OiTices. Suitable for a family wishing to spend a few months in th« 

 country. Terms moderate. — Apply X.Y., care of Naturs Office, 29, 

 Bedford Street, Strand. 



DUNHEVED COLLEGE (LIMITED), 



LAUNCESTON, CORNWALL. 

 ScTcn hours from London. Sepakate Bedrooms, Systematic Teaching 

 n SciEN'CE, Foreign Languages, and University Courses. 

 Calendar post free from 



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



iiOYAL POLYTECHNIC— CLASSES for 



the preparation of Students for University Examinations, under the 

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

 versity Afatriculation, ist and 2nd B.Sc, Preliminary Scientific M.B., 

 Botany, Physiology, Chemistry. All the work practical. 



JT. PAUL'S SCHOOL.— In the course of the 



next few weeks a SCIENCE MASTER will be appointed at this School 

 to teach CHEMISTRY and CHEMICAL PHYSICS. Salary, ;e3oo 

 a year. The Gentleman who accepts the Office will be expected to b« 

 in attendance at the School durincf the ordinary School Hours, i.e., 

 Twenty-nine Hours a Weelc. — Testimonials to be sent to the High 

 Master, St. Paul's School, St. Paul's Churchyard, London, E.C. 



DIAMONDS IN MATRIX. 



R. C. Ni CKOLD, Diamond and Oriental Stone Cutter and Dealer, has 

 irsale specimens of the above; also Cut Precious Stones in all Colours. 

 12, FRITH STREET, SOHO. W. 



fOR SALE.— INDIAN ELEPHANT 



SKELETONS, two monsters, nearly twelve feet high, one macerated 

 the other not ; one has tusks valued at Rs. 400 ; to be sold, a bargain. 

 Can be seen at 6, Somerset Villas, Lordship Koad, Stoke Newingt»n, 

 London. 



Several Skins of Elliott's Pheasant on hand. 



SHEPPEY FOSSILS. 



H. SHRUBSOLE, F.G.S., Shberness-on-Sea, h.iving a large 

 Btity of the .ibove on hand, ofTers. FOR A FEW WEEKS ONLY, 

 3 good Specimens, correctly named, for 5J. ; loo assorted Specimens, un- 

 ited, 2J. Not less than 50 sent at these rates. 



JHIN GLASS FOR MICROSCOPIC 



MOUNTING, of best quaKty. Cu-cles, xs. ^d. frounce; Squares, 

 21. (id. : post free 2d. extra ; Ground edged Slips, 51. per gross : also 

 otlier Mounting Materials and Objects prepared for mounting.— CHAS. 

 PETIT, 151, High Street. Stoke Newington, N. 



BORATORV, 38, GRACECHURCH STREET, LONDON, E.C. 



A. ANTHONY NESBIT, F.C.S., 



WATER ANALYST, 



Performs every description of Water Analysis on moderate terms, 

 j-ly cleansed bottles for the reception of samples sent to any part of 

 the Kiogdom. 



-ECTRICAL, SCIENTIFIC, & PHOTO- 



I GRAPHIC APPARATUS.-Electric Bells, Fire ard Thief Alarms, 



I snd Automatic Switches. Induction Ceils, Erictionat Machines, I..amps, 



id Batteries. Microphones, Wires, Magnets, Carbons, and all Mate* 



; ..Is. Repairs and Alterationc:. New Illustrated Descriptive Caulogtie, 



■'::e Stamp. Cameras, Dry Plates, Sensitive Paper, and all Chemicals. 



I'hoto. List free.— DALE & CKAMPTON, Manu&cturing OptUiant, 



4. Little Britain, London, E.C. 



DIAMONDS AND OTHER PRECIOUS STONES. 



In consequence of the many spurious gems now being offered for sale, 

 Mr. Bryce-Wright is prepared to give a 



SCIENTIFIC GUARANTEED OPINION 



AS TO THE 



GENUINENESS, PURITY. AND APPROXIMATE VALUE 



Of Stones, Mounted or Unmounted, submitted to his inspection. 



BRYCE-WRIGHT, 



Mituralo^ist, and Expert in Ceins and Precious Sioms, 



90, GREAT RUSSELL STREET, LONDON, W.C. 



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 

 G«ological Hanuners, with prices. List of Naw and Second-hand Books of 



JAMES R. GREGORY, 



MUSEUM OF GEOLOGY, 

 88, CHARLOTTE STREET, FITZROY SQUARE. 



MINERALOGY AND GEOLOGY. 



COLLECTIONS TO ILLUSTRATE THE ABOVE SCIENCES, 

 FROM 41. 



SINGLE SPECIMENS FROM 3^. 



DIOPTASE, ZIRCON, RUBELLITE, XANTHOPHYLLITE, 

 SIBERIA. 



KEILHAUITE, PYROCHLORE, APATITE, NORWAY. 



A SMALL QUANTITY OF THORITE AND ORANGITE, VERY 

 RARE. 



BLOWPIPE CASES, HAMMERS AND CHISELS, AND CRYS- 

 TAL HOLDERS. 



PBIVATE LESSONS AND EVENING CLASSES. 

 SAMUEL HENSON, 

 277 (Lale II3<3), STRAND, LONDON, W.C. 



MINERALS, ROCKS, AND FOSSILS. 



COLLECTIONS IN CABINETS. 



Two Hundred Specimens, 401. ; 150 do., 301. ; 100 do., aoj. ; 50 do., lof, 

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



Superior Cabinets_ fitted with Card-Trays and Catalogue included. 



"The Popular Scientific Pocket Cabinet Series " comprises 9 Cabinets and 

 134 Specimens. 2j. 6d. each Cabinet, free delivery, ^d. (See Nature, 

 March 13, No. 489, page 447.) 



The Collector's Field Apparatus complete, 2iJ. Hammer-holder and 

 Waist-strap, price 2j. CoUccting-bag (figured and described), price 4J. 



THOMAS J. DOWNING, Geologist, &c., 



38, WllISKIN STREET, LONDON, E.C. 

 Catalogue, Lists, and " Quarterly Circular " free on receipt of 2d. postage. 



Mn TENNANT, F.G.S., Professor of 



Mineralogy and Geology, Mineralogist by Appointment to Her Majesty 

 arKi the Baroness Burdett-Coutts, 149, Strand, London, W.C, having 

 been fifty years in business, contemplates shortly RETIRING, and 

 offers for SALE several of his extensive COLLECTIONS of Minerals, 

 Rocks, and Fossils. They are well adapted for first-class Educational 

 Establishments, Provincial or Colonial Museums, or for the Private 

 Study of any Scientific Person wishing to become acquainted with the 

 abovc-menUoned Sciences. From ;Ci,ooo to 5,000 Gumeas. Students' 

 Collections at 2, 5, 10, 20, to 50 Guineas. 



W. F. STANLEY, 



Mathematical Instrument Manufacturer 



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

 Department, Admiralty, &c. 



MatiiMnatical, Drawing, and Surveying Instruments of every description, •! 

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



Prite List post free. Engine Divider to the Trade. 

 ADDRESS- 

 GREAT TURNSTILE, HOLBORN, LONDON, W.C. 



FOR 



««HALL MARK" 

 THERMOMETERS. 



Th« Kew Committee of the Roval Society hereby give Notice that aft«r 

 tkis date all Thermometers verified at the Kew Observatory will be marked, 

 fr«o of expense, with their monogram, *' K.O.," interlaced, and a register 

 •umber, in addition to the maker's number. 

 Tke Table of Errort will be furnished as usual. 

 liy order, 



G. M. WHIPPLE, SuperlnNodmC 

 Kew Observatory, December 13, 1878. 

 Scale of Charges for Verification, &c., post free on application. . 



