xlii 



NATURE 



\7une I, 1879 



WANTED, Ckatt Copies of NATURE, No. 472, 

 for November 14, 1878. Address — Office of 

 NATURE, 2g,. Bedford Street, Strand. 



MICROSCOPIC OBJECTS 



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

 scopy. Catalogue post free and gratis on application. 



PARIS UNIVERSAL EXHIBITION, 1878. 



Prize Medal awarded for Excellence, Variety, &'c. 

 IDMUND WHEELER, 48N, Tollington Road. Holloway, London, N. 



OWENS COLLEGE, MANCHESTER. 



The Council propose to appoint a separate Professor of Zoology. Candi- 

 dates are invited to send in Applications and Testimonials under cover to the 

 Registrar not later than the 28th June. 



Details as to the duties and emoluments of the office may be obtained en 

 application to the Principal, Dr. Greenwood. 



J. HOLME NICHOLSON, Registrar. 



The COUNCIL of the YORKSHIRE COL- 



LEGE, LEEDS, invite Applications for the post of ASSISTANT 

 LECl'URER in CLASSICS and MATHEMATICS. Stipend, ^100 

 a year, and a share of certain tutorial fees. Duties to commence Octo- 

 ber 1st. Preference will be given to Graduates of the University of 

 London. Applications, accompanied by copies of testimonials, to be 

 sent on or before Friday, June 27th, to the Secretary, from whom 

 further information as to duties may be obtained. 



VICTORIA (PHILOSOPHICAL) INSTI- 



TUTE.— The ANNUAL MEETING will be held at 8 o'clock, June 

 i6th, at the House of the Society of Arts (by kind permission of that 

 Society). The President in the Chair. 

 The Address will be delivered by Dr. Radcliffe. 



*»* Those wishing to join as Members or Associates should send in their 

 names as soon as possible before the Annual Meeting, so as to insure the 

 special privileges accorded to those joining this year. 

 Particulars sent on application. 



F. PETRIE, Secretary to the Council. 

 House of the Institute, 7, Adelphi Terrace, 

 London, W.C. 



LIBRARY OF HARVARD UNIVERSITY, 

 CAMBRIDGE, MASS., U.S.A. 



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

 Libraries (Astronomical Observatory, Botanic Garden, Bussey Institution, 

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

 School), may be sent to the Agents, Messrs. TrSener & Co., 57 and -ia. 

 Ludgate Hill, London. *' 



JUSTIN WINSOR, Librarian. 



"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., pest free on application. 



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 and B.Sc, Preliminary Scientific M,B., 

 notany, Physiology, Chemistry. All the work practical. 



TUITION for the UNIVERSITIES, CIVIL 



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

 Kensington. Address — Tutor, Lamley's Library, Thurloe Place, 

 South Kensington. 



DUNHEVED COLLEGE (LIMITED), 



LAUNCESTON, CORNWALL. 



Seven hours from Loi^dgn. Skparate Bedrooms. Systematic Teaching 

 in Science, Foreign Languages, and University Courses. 



Calendar post free from' ■ ' 

 - Thb PiiiNCii'Ai.—BENTAMIKr RALPH. LL.B. Dub. 



FOR SALE.— A very fine SPECTROSCOPE 



of two large prisms, micrometers, and all necessary apparatus of the 

 best c< n>truction ; made for astronomical faint spectra, but suitable for 

 many tther branches of study. Has never been used. Original cost, ; 

 £,S^ ; «'I1 be sold for /15. To be seen at the maker's, Mr. J. Brown- 

 ie.*;, 6- Strand,- I 



LIVING SPECIMENS FOR THE MICROSCOPE. 



THOMAS BOLTON, MICROSCOPIST'S and NATURALISrS 

 STUDIO, 17, ANN STREET, BIRMINGHAM. 



T. B. has last week posted to his subscribers the Pitcher Rotifers, 

 Brachionus />aln or Brachionns urceolaris^ with drawing and description. 

 He has also distributed Volvox flobator, Uro^Unn volvox, Closlerium, 

 Protococcus, Nitella, Chara, Valhsneria, Amoibse, Trathelius ovum, Vorti- 

 cellidse, Hydrz, Cristatella, Paludicella, Stephanoceros, Melictrta tubico- 

 laria, Hydatina, Philodina, &c. 



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

 is supplying. 



Specimen Tube, One Shilling, post-free, 



Twenty-six Tubes in course o/ Six MontJis for Suliscri/ition if £l is. 

 Price List of Specimens on application, with stamped addressed envelope. 



A COMPLETE SET of CHEMICAL Ap- 

 paratus for TEACHING and ANALYSIS for SALE, together or 

 separately.— Address A. B.C., care R. S. Kirk, Advertising Agent, 82. 

 New Street, Birmingham. 



VERY PORTABLE MICROSCOPE, i inch, 



i Ross, objectives ; a, b, c eyepieces; paraboloid, polariscope, sketch- 

 ing diagonal, &c. Ten Guineas.— Rev. S. Kincaid, Training College, 

 Carmarthen. 



ELECTRICAL, SCIENTIFIC, & PHOTO- 



GRAPHIC APPARATUS.-Elcctric Bells, Fire a.'d Thief Alarms, 

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

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

 rials. Repairs and AUeraticns. New Illustrated Descriptive Catalogue, 

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

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

 4, Little Britain, L ondon, E.C. 



THIN GLASS FOR MICROSCOPIC 



MOUNTING, of best quality. Cu-cles, 3J. 6d. per ounce ; Squares, 

 zs. gd- ; post free 2d. extra ; Ground edged Slips, 51. per gross ; also 

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

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



SHEPPEY FOSSILS. 



W. H. SHRUBSOLE, Shherness-on-Sha, 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 10s. Collections of 100 *'good*' specimens can be executed 

 without delay. 



•; NOTES ON THE GEOLOGY OF SHEPPEY" post free on appii- 

 cation. 



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 ard Materials of all kinds in Cases or separately. New Patterns jf 

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



JAMES R. GREGORY, 



MUSEUM OF GEOLOGY, 



88, CHARLOTTE STREET, FITZROY SQUARE. 



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 3S, Whiskin Street, London, E. C. 



J^ree on receipt fif Posiir^e. 



MINERALOGY AND GEOLOGY. 



FINE AND INTERESTING GENICULATED CRYSTALS OF 



CASSITERITE, BRITTANY. 

 CUPRITES, NATIVE COPPERS, AND CHALCOTRICHITES. 



SERVIA. 

 MOLYBDATES OF LEAD, UTAH. 

 SILVER ORES FROM THE "EMMA" MINE. 

 CALCITES, CUMBERLAND. CERUSITES, UTAH. 

 TABLE OF HARDNESS, zs. id. 



PBIVATE LESSONS AND EVENING CLASSES. 



SAMUEL HENSON, 

 277 (Lateiiza), STRAND, LONDON, W.C. 



DIAMONDS AND OTHER PRECIOUS 



STONES. Scientific opinion givenas to GENUINENESS, PURITY 

 and VALUE.- Bryce Wright, 90, Great Russell Street. I.ondon, 



