11 



NATURE 



{May I, 1879 



WANTED, Clean Copies of NATURE, No. 472, 

 for November 14, 1878. Address — Office of 

 NATURE, 29, Bedford Street, Strand. 



MICROSCOPIC OBJECTS 



Of superlative perfection, illustrating Histology and eveiy branch of Micro- 

 scopy. Catalogue post free and gratis on application. 



PARIS UNIVERSAL EXHIBITION, 1878. 



Prixe Medal awarded for Excellencef Variety, 6^r. 

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



A GENTLEMAN who is going on a Dredg- 

 ing Cruise round the British Isles would be glad to meet another Natu- 

 ralist who would be willing to accompany him during the whole or part 

 of the voyage. — For further particulars apply to C. P. Ogilvie, F.L.S. 

 Siaeville House, Leiston, Suffolk. 



BRITISH MUSEUM. 



The British Museum will be CLOSED on the ist and RE-OPENED on 

 the 8th of MAY. Visitors cannot be admitted from the ist to the 7th of 

 May, inclusive. 



EDWARD A. BOND, Principal Librarian. 



April 24th, 1879. 



ROYAL ALBERT HALL.— Exhibition of 



Electric Lighting Apparatus. — The Council announce that an EXHI- 

 BITION of ELECTRIC LIGHTING APPARATUS will be inaugu- 

 rated in the presence of H.R.H. the Prince cf Wales, at the Royal 

 Albert Hall, on WEDNESDAY EVENING, May 7th, at 8.30 pre- 

 cisely, when a Lecture on the general .'subject, with Illustraticns, will be 

 given by W. H. PREECE, Esq. Admission :— Stalls, 3J. : Balcony 

 and other parts of the Hall, \s. The Exhibits will ctinx>rise most of 

 the systems used in Electric Lighting, with the machines for their pro- 

 duction in operation. The Exhibition will be held in the Arena of the 

 Hall, and will remain on view until Saturday evening, loth May. 



DUNHEVED COLLEGE (LIMITED), 



LAUNCESTON, CORNWALL. 

 SeTcn hours from London. Separate Bedrooms. Systematic Teaching 

 in Science, Foreign Languages, and University Courses. 

 Calendar post free irom 



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- 

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

 Botany, Physiology, Chemistry. All the work practical. 



ELECTRICAL, SCIENTIFIC, & PHOTO- 



GRAPHIC APPARATUS.- Electric Bells, Fire and Thief Alarms, 

 and Automatic Switches. Induction Coils, Fricticnal Machines, Lamps, 

 and Batteries. Microphones, Wires, Magnets, Carbons, and all Mate- 

 rials. Repairs and Alteratii ns. New Illustrated Descriptive Catalrgue, 

 one Stamp. Cameras, Dry Plates, Sensitive Paper, and all Chemicals. 

 Photo. List free.— DALE & CRAMPTON, Manufacturing Opticians, 

 ^, Little Bnta.D, London, E.C. 



TUITION for the UNIVERSITIES, CIVIL 



Service, and Army. — Pupils prepared fcr the above by a Tutor in South 

 Kensington. Address — Tutok, Lamley*s Library, Thurloe Place, 

 South Kensington. 



LIBRARY OF HARVARD UNIVERSITY. 

 CAMBRIDGE, MASS., U.S.A. 



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

 Libraries (A^trono^lical Observatory, Botanic Garden, Eussey Institution, 

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

 School), may be seat to tke Agents, Messrs. TrCbner & Co., 57 and 59, 

 LudgateHill, Landoa. 

 JUSTIN WINSOR. Librarian. 



SHEPPEY FOSSILS. 



W. H. SHRUBSOLE, Sheerness-on-Sea, respectfully intimates that 

 the appeal recently made by him has been so heartily responded to, that he 

 cannot receive any more orders for " extra selected " specimens at present. 



Orders for lay. Collections of 100 " good " specimens can be executed 

 without delay. 



'; NOTES ON THE GEOLOGY OF SHEPPEY" post free on appU- 

 cation, 



JUST OUT. 



A QUARTERLY CIRCULAR for the PRO- 



FESSOR, STUDENT, and CONNOISSEUR in GEOLOGY and 

 MINERALOGY, &c., &c. 



being a list of 



THOMAS J. DOWNING'S LATEST ARRIVALS OF 



ROCKS, 



FOSSILS, 



MINERALS, 



APPARATUS, COLLECTIONS, NOTICES, &c 



Published at 38, Whiskin Street, London, E.C. 



Free on receipt 0/ Postage, 



LIVING SPECIMENS FOR THE MICROSCOPE. 



THOMAS BOLTON, MICROSCOPIST'S and NATURALIST'S 

 STUDIO. 17, ANN STREET, BIRMINGHAM. 



T. B. has last week posted to his subscribers Batrachosp<mfHfn rHonili- 

 Joftne. He has also distributed Cristatella, Plumatella, Fredericella, 

 Stephanoceros, Floscularia, Melicerta, Hydatina, Fhynops, Euglena, Pan- 

 donna, Nitella, Desmids, young Eels, &c. 



Weekly announcements will be made in this place of orgaaisms T. B, 

 is supplying. 



Price List of Specimeni on application, with Stamped Addressed 

 Envelope. 



A friend has offered T. B. a constant supply of m^unted and unmounted 

 specimens of all kinds of Parasites of Man and Animals (Entozoa and 

 Ectozoa), also sections of all Mammalian organs. 



Specimen Tube, One Shilling, post-free. 



Twenty-six Tubes in course of Six Months /or Subscription of jit is. 

 Price List of Specimens on application, with stamped addres.sed envelope. 



THIN GLASS FOR MICROSCOPIC 



MOUNTING, of best quality. Cycles, v- di- per ounce ; Squares, 

 3J. ^. ; post free 2*/. extra ; Ground edgeci Slips, 5J. per gross : also 

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

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



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



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



WATER ANALYST, 



Performs every description of Water Analysis on moderate terms. 



Properly cleansed bottles for the reception of samples sent to any part of 

 the Kingdom. 



MINERALOGY AND GEOLOGYr 



A New List of Collections of Fossils, Minerals, and Rocks now read^, 

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

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

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

 Geological Hammers, with prices. List of New and Second-hand Books of 

 JAMES R. GREGORY, 

 MUSEUM OF GEOLOGY, 

 88, CHARLOTTE STREET, FITZROY SQUARE. 



MINERALOGY AND GEOLOGY, 



COLLECTIONS ILLUSTRATING ABOVE SCIENCES FROM 4'- 



ALSO SINGLE SPECIMENS AT VERY REASONABLE PRICES. 



POLISHED STALAGMITE AND FLUOR SPAR. 



SCRAPS FOR BLOWPIPES is. per do2. boxes. 



TABLE OF HARDNESS, 2J. dd. 



GEOLOGICAL CHISELS AND HAMMERS. 



PKIVATf; LESSONS AND LVENING CLASSES. 



SAMUEL HENSON, 

 277 (Zfl/f 1 13a), STRAND, LONDON, W.C. 



GEOLOGY In the Preface to the Student's 



ELEMENTS of GEOLOGY, by Sir Charles Lyell, price 91., he iays : 

 — " As it is impossible to enable the reader to recognise rocks and mme- 

 rals at sight by aid of verbal descriptions or figures, he will do well to 

 obtain a well arranged collection of specimens, such as may be procured 

 from Mr. TENNANT(r49, Strand), Teacher of Mineralogy at King's 

 College, London." These Collections are supphed on the foUowine 

 terms, in plain Mahogany Cabinets : — 



100 Specimens, in Cabinet, with 3 Trays ......... £* 1 o 



SCO Specimens, in Cabinet, with 5 Trays »..»». 5 5 o - 

 300 Specimens, in Cabinet, with 9 Drawers ... » zo zo • 

 400 Specimens, in Cabinet, with Z3 Drawers «, .» sz 00 

 More extensive Collections at 50 to 5,000 Gtlineas each. 



DIAMONDS IN MATRIX. 



R. C. NOCKOLD, Diamond and Oriental Stone Cutter and Dealer, has- 

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

 12, FRITH STREET, SOHO, W. 



MICROSC OPIC O BJECTS. 



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

 Fish Scales, Anatomical Preparations from the Human Subject and Lower 

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

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

 mala. Spicules of Sponges and Gorgonias, Foraminifera, Botanical Prepara- 

 tions, Diatomacex, SalU, Crysttls, Sections of RwJts, Fossils, Minerals, 



*"=■ 

 Ochreoul Iron in Moss-like Forms in Calcite, rx. 6rf. post-free. 

 Stellar Mica, or Canadian Phlogopite, tj. id. post-free. 

 Catalogues free. 



THOS. D. RUSSELL, 



48, ESSEX STREET, STRAND, LONDON, W.C. ' 



