CXCVlll 



WANTED, Clean Copies of NATURE, No. 472, 

 for Noreftiber 14, 1878. Address — Office of 

 NATURE, 29, Bedford Street, Strand. 



MICROSCOPIC OBJECTS 



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

 scopy. Catalogue post free and gratis on application. 



PARIS UNIVERSAL EXHIBITION, 1878. 



Prite Medal awarded for Excellence, Variety, &^c. 

 EDMUND WHEELER, 48N, Tollington Road, HoUoway, London, N. 



ROYAL SOCIETY OF LITERATURE.— 



The General Anniversary Meeting of the Society for the Election of 

 President, Vice-presidents, Council, and Officers, for the ensuing year, 

 and for other business, will be held on WEDNESDAY, the 30th instant, 

 at the society's Huuse, 4, St. Martin's Place, Trafalgar Square. The 

 Chair will be taken at half-past 4 o'clock precisely. 

 April, 1879. W. S. W VAUX, Secretary. 



THE MIDDLESEX HOSPITAL 

 MEDICAL SCHOOL. 



SUMMER SESSION, 1879. 



Lectures and Clinical Instruction in the Wards will commence on May ist. 



Gentlemen can enter to any one Course or to Hospital Practice only. 

 Two Entrance Sch ilarships, of the annual value of £2^ and £20 respec- 

 tively, will be offered f ^r competition at the beginning of the Winter Session. 

 The Broderip and Murray Scholarships are competed for by students who 

 have completed their third Winter Session. 



For prospectus containing particulars as to Resident Appointments, Fees, 

 &c., apply to the Dean or the Resident Medical Officer at the Hospital. 



ANDREW CLARK, Dean. 



INSTITUTE of CHEMISTRY,— The Presi- 



dent has offered two Prizes of £$0 each for the two best original Inves- 

 tigations involving Gas Analyses. These Prizes will be open to Asso- 

 ciates, and to all persons (except Fellows of the Institute) who shall, 

 before the 31st December next, have qualified for the Associateship in 

 all respects short of passing the prescribed Practical Examination ; and 

 successful competition for these Prizes will be accepted in lieu of such 

 practical examinaiion. — Further information may be obtained on appli- 

 cation to the Secretary, Mr. C E. Groves, Somerset House Terrace, 

 W.C. 



*'HALL MARK" 

 FOR THERMOMETERS. 



The Kew Committee of the Royal Society hereby give Notice that after 

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

 free of expense, with their monogram, "' K.O.," interlaced, and a register 

 number, in addition to the maker's number. 



Ihe Table of Errors will be furnished as usual. 

 By order, 



G. M. WHIPPLE, Superintendent. 

 Kew Observatory, December 13, 1878. 

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



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. 

 SizeviUe House, Leiston, Suffolk. 



A GRADUATE in Natural Science Honours 



(Oxon.) prepares Gentlemen for Ex.Tminations in Chemistry, Physics, 

 and Elementary Mathematics — Address Alpha, care of Publisher of 

 Nature, 29, Bedford Street, Strand. 



FOR SALE.— Just received from Calcutta, 



a few CASES of BUTTERFLIES. Some very rare specimens. — Apply 

 to Ledgkr, Smith, and Co., East India Merchants, 9, Dowgate Hill, 

 Cannon Street, E.C. 



FOR SALE.— NATURE. Complete Set 



from the beg.nning to present date (21 vols.), bound in cloth. Offers 

 for the same to be addressed to No. 7, Messrs. Keith and Co., Adver- 

 tising Agents, Edinburgh. 



TUITION for the UNIVERSITIES, CIVIL 



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

 Kensington. Address — Tutor, 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 (Astronomical Obsenatory, Botanic Garden, Bussey Institution, 

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

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

 Ludgate Hill, London. 



JUSTIN WINSOR, Librarian. 



A^A TURE [April 24, 1 879 



LIVING SPECIMENS FOR THE MICROSCOPE^ 



THOMAS BOLTON, MICROSCOPIST'S and NATURALISTS 

 STUDIO, 17. ANN STREET, BIRMINGHAM. 



T. B. has last week posted to his subscribers Nite'la translucent covered 

 with CarchestUMt polypinum, with drawing of the latter and other Vorti- 

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

 Stephanoceros, Floscularia. Melicerta, Hydatma, Rhynops, Euglena, Pan- 

 dorina, Nuella, Desmids, Frog Spawn, &c. 



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

 is supplying. 



Price List of Specimens on application, with Stamped Addressed 

 Envelope. 



A friend has offered T. B. a constant supply of mounted and unmounted 

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

 Ectozoa), also sections of all Mammalian organs. 



FOR SALK.—A COMPACT, GENERAL 



COLLECTION of FOSSILS, the property of a Gentleman who, 

 through adverse circumstances connected with ill-health, is under the 

 necessity of parting with his geological treasures. It includes about 

 500 specimens^ representing, say, 250 Species. Price £(>. 



W. H. SHRUBSOLE, F.G.S., SHEERNESS-ON-SEA, in the hope of 

 thereby helping a friend, will be glad to furnish full particulars. 



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. 



DUNHEVED COLLEGE (LIMITED), 



LAUNCESTON, CORNWALL. 

 Seven 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- 

 versity Matriculation, 1st 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, Frictional Machines, Lamps, 

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

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

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

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

 4, Little Britain, London, E.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- 

 la us ard 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 4J. 



ALSO SINGLE SPECIMENS AT VERY REASONABLE PRICES. 



POLISHED STALAGMITE AND FLUOR SPAR. 



SCRAPS FOR BLOWPIPES ss. per do2. boxes. 



TABLE OF HARDNESS, 2J. (,d. 



GEOLOGICAL CHISELS AND HAMMERS. 



PRIVATE LESSONS AND EVENINCJ CLASSES- 



SAMUEL HENSON, > 



277 (_Late\\la), STRAND, LONDON, W.C. 



GEOLOGY.— In the Preface to the Student's 



ELEMENTS of GEOLOGY, by Sir Charles Lyell, price gj., he says : 

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

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

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

 from Mr. TENNANT (149, Strand), Teacher of Mineralogy at King's 

 College, London." These Collections are suppUed on the following 

 terms, in plain Mahogany Cabinets : — 



100 Specimens, in Cabinet, with 3 Trays m. m. ~. ;£s a o 

 200 Specimens, in Cabinet, with 5 Trays ...... .~ 5 5 



300 Specimens, in Cabinet, with 9 Drawers ... ... 10 10 o 



400 Specimens, in Cabinet, with 13 Drawers ... ... 21 o o 



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



