cxlvi 



NATURE 



[March 15, 1879 



MICROSCOPIC OBJECTS 



Of fUperUtive perfection, illuttrating Histology and every branch of Micro- 

 scopy. Catalogue post free and gratis on application. 



PARIS UNIVERSAL EXHIBITION, 1878. 



Prize Medal awarded for Excellence, Variety, 6r'c. 

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



" SOCIETY OF ARTS. 



JOHN STREET, ADELPHI, LONDON, W.C. 



PRESIDENT: H.R.II. The PRINCE OF WALES, K.G. 



The Annual Conference on Xational Water Supply, Sewage, and Health 

 •will be held in the Rooms of the Society of Arts, on THURSDAY and 

 FRIDAY, the 15th and j6th May, 1S70, 



The Right Hon. JAMES STANSFELD, M. P., in the Chair. 

 The Council will be glad to receive offers of suitable papers on subjects 

 relating to the object of the Conference. 



Intending Authors of such papers should communicate at once with the 

 Secretary of the Society o^Arts. By Order, 



H. T. WOOD, Secretary. 



THE SCIENTIFIC CLUB. 



The Committee of this Club, which was founded in 1874 for the asscclalion 

 .of gentlemen of scientific tastes and pursuits, have just secured the lease of 

 the house No. 4, Savile Row. This will afford to the members all the 

 accommodation of a quiet club. They are prepared to receive applications 

 from gentlemen desirous of joining the Club up to June 30, 1879, en the 

 present terms of membership. Admission Fee, Five Guineas ; Town Members 

 Four Guineas, Country Members, Two Guineas. 



RESIDENT GOVERNESS WANTED, 



with some knowledge of Natural History, including Field Botany, 

 and able to teach music and prepare a pupil of 12 for examination. 

 Address — '" M. F. ," 5, Mount Street, Grosvenor Square, W. 



TUITION fo7the 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. 



PROFESSOR CLIFFORD.— A Memorial 



.Service and Discourse will be delivered by Mr. Moncure D. Conw.w 

 on Sunday morning, the 16th inst., at South Place Chapel, Finsbury, 

 II IS A..M. 



DUNHEVED COLLEGE (LIMITED), 



LAUNCESTON, CORNWALL. 

 Seven hours from London. Separate Bedrooms. Systematic Teaching 

 n Science, Foreign Languages, and University Couksbs. 

 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, 1st and 2nd B.Sc, Preliminary Scientific M.B., 

 Botany, Physiology, Chemistry. All the work practical. 



BERNERS COLLEGE.— The Laboratory 



and Class Rooms are open for Private and Class Study, morning and 

 evening. ANALYSES performed. Especial arrangements for Gentle- 

 men and Ladies preparing for the various Examining Boards. Fees 

 moderate. — Apply to Prof. Gardner, at Bemers College, 44, Bemers 

 Street. W. 



"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, 

 *.-ee of expense, with their monogram, •' K.O.," interlaced, and a register 

 Sumber, in addition to the maker's number. 



Uhe 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. 



SUNDAY LECTURE SOCIETY.— LEC- 



TURES at ST. GEORGE'S HALL, Langham Place, each SUNDAY 

 AFTERNOON, commencing at Four o'clock precisely. Sunday, 

 W-irch 16.— Mrs. Fenwick Miller, en "Our Puritan Forefathers: 

 the Early Struggle for Freedom of Thought in England." — Members' 

 Annual Subscription, £,\. Payment at the Door — One Penny, Sixpence, 

 and (reserved seats) One Shilling. 



TO INVENTORS and OTHERSi^The 



Directors of the ROYAL POLYTECHNIC are prepared to exhibit 

 and explain all Inventions and Discoveries of public interest. — For 

 particulars apj.ly to the Secretary ef the Institution. 



WITHERNDEN SCHOOL, CATERHAM 



VALLEY, SURREY.— Principal, Mr. C. H. LAKE, B.A. Loud, (in 

 HoEotnrs). Education 00 Natural PriQcipJ«s. A limited number of PupUs. 



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 .^iibEcribers Euglena viridis and llydtt- 

 iina senta with Illustrations. He has also distributed Embryo Trout ancL 

 Salmon, Frog Spawn, Sponge, Plumatella, Fredericella, Mtl.certa, FIccu- 

 laria, CEcistes, &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 unmcuntcd. 

 specimens of all kinds of Parasites of Man and Animals (Entoica an" 

 Ectozoa), also sections of all Mammalian organs. 



LIBRARY OF HARVARD UNIVERSITY, 

 CAMBRIDGE, MASS., U.S.A. 



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

 Libraries (Atronomical Obser\atory, Botanic Garden, Bussey Institution; 

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

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

 LudgateHill, London. 



JUSTIN WINSOR, Librarian. 



ST. BARTHOLOMEW'S HOSPITAL 

 AND COLLEGE. 



A Class for the Matriculation Examination of the University of Lord-^n 

 will begin on MONDAY, March zo, at 4 p.m., and be continued till July, 

 The Class is open to others than Students of the Hospital. Fee. £10 io.f. 



For particulars application may be made personally or by letter to the 

 Warden of the College, St. Bartholomew's Hospital, E.C. 



SCIENCE MASTER. — A Gentleman oi 



considerable experience in lecturing and laboratory teaching in Chemi.s- 

 try, will shortly be open to an Engagement. Highest references 

 Address L. 31, at C H. May and Co.'s General Advertising Offices 

 78, Gracechurch Street, E.C. 



OWENS COLLEGE, MaNCHESTERT 



The Office of DEMONSTRATOR and ASSISTANT LECTURER id 

 PHYSIOLOGY in the College will become VACANT at the end of March, 

 The Salary offered is ;{; 1 50 per annum. The Dean of the Medical School 

 will give further information if desired. 



Applications addressed to the Senate, and testimonials (printed copie 

 would be desirable), will be received up to the 22nd March. 



J. HOLME NICHOLSON, Registrar. 



HOW^to MAKE a TELESCOPE, a MICRO- 



SCOPE, and a MAGIC LANTERN. How to TAKE a PHOTO- 

 GRAPH and PRINT aCARTE, see ILLUSTRATED CATALOGUE, 

 now ready, 3 stamps. Containing full direction for above, and how to 

 TRANSFER LANTERN SLIDES. 



J. L.\NCASTER & SON, Bull Street, Birmingham. > 



The LANCASTER ELECTRIC LAMP, de- 



vised by W.J. LANCASTER, F.C.S., F.R.A.S., «c., in three siie^ 

 No. I, to burn 3 hours, £2 2S.; No. 2, to burn 6 hours, ;^3 35. ; largest 

 size, £$ ^s. .Set of 20 Quart Bunsen's Cells, £^ 45. Model Eltctri 

 Lamp and 10 Cells, £2 12J. 6d. 



ELECTRICAL & SCIENTIFIC APPARA- 



TUS for AMATEURS and the TRADE.— Microphones of every form, 

 from IS. dd. New cheap Electric Lamps and Batteries. Indiictioa 

 Coils and Frictional Machines are specialties. Electrical Bells, Fire 

 and Thief Alarms, and Automatic Swuch-bcards. Magnets, Covered 

 Wires, Screws, and all Materials. Apparatus for Science TeacV.ers. 

 Illustrated Catalogue, one stamp. Repairs and Alterations. Appara- 

 tus made to sketch.— DALE & CRAMPTON, Manufacturing Elec- 

 tricians, 4, Little Britain, E.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 recogmsc 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 as may be procured 

 from Mr. TENNANT (149, Strand]*, Teacher of Mineralogy at King'* 

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

 terms, in plain Mahogany Cabinets : — 



100 Specimens, in Cabinet, with 3 Trays .» .» •« ;£> 9 » 

 200 Specimens, in Cabinet, with 5 Trays .........550 



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. 



THIN GLASS FOR MICROSCOPIC 



MOUNTING, of best quality. Cycles, 3J. f>d. per ounce ; Squares, 

 25. gd. ; post free i.d. extra ; (3rouna edged Slips, SJ. per gross : also 

 other Mounting Materials and Objects prepared for mounting. — CHA&. 

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



DIAMONDS IN MATRIX. 



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

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

 12, FRITH STREET, SQHO, W. 



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