clxii 



NATURE 



\March 27, 1879 



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, Holloway, London, N. 



ROYAL INSTITUTION OF GREAT 

 BRITAIN, 



ALBEMARLE STREET, W. 



The next ACTON IAN PRIZE will be awarded in the year 1879 to an 

 Essay illustrative of the Wisdom and Beneficence of the Almighty ; the 

 subject being, "The Structure and Functions of the Retina in all Classes of 

 Animals, viewed in Relation with the Theory of Evolution." The Prize is 

 One Hundred Guineas, and will be awarded or withheld as the Managers in 

 their judgment shall think proper 



Competitors for the Prize are requested to send their Essays (with or with- 

 out their names being affixed) to the Royal Institution, addressed to the 

 Secretary, on or before the First of October, 1879. The adjudication will 

 be made by the Managers in 1879. 



WARREN DE LA RUE, Sec. R.I. 



ZOOLOGICAL SOCIETY'S 

 PUBLICATIONS. 



Now ready. 



"Proceedings of the Scientific Meetings of the Society for 1878." Par' 

 IV., concluding the volume, containing the Papers read at the Scientific 

 Meetings in November and December, 1878. With 16 Plates, mostly 

 coloured, 12J. ; with Plates, uncoloured, 3J. 



May be had at the Society's Office (11, Hanover Square, W.), at 

 Messrs. Longmans', the Society's Pubhshers (Paternoster Row, E.C.), 

 or through any Bookseller. 



SUNDAY LECTURE SOCIETY.— LEC- 



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

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

 March 30.— William Clarke, Esq., B.A. (Cantab.), on "Joseph 

 Mazzini." — Members* Annual Subscription, {,1. Payment at the Door — 

 One Penny, Sixpence, and (reserved seats) One Shilling. 



FOR SALE. — LARGE MONOCULAR 



MICROSCOPE ; mechanical stage, polariscope, frog-plate, 2 eye- 

 pieces ; i-inch, l-inch, and J.inch objectives, and accessories, for ;^i5. 

 —Box C, Post Office, Homcastle. 



WANTED, "A MONOGRAPH of the 



FOSSIL POLYZOA of the CRAG." By GEORGE BUCK, F.R.S., 

 &c. (London : Printed for the Palaeontographical Society, 1859.) 4to- 

 Messrs. BELL, 4, York Street, Covent Garden. 



LIBRARY OF HARVARD UNIVERSITY, 

 CAMBRIDGE, MASS., U.S.A. 



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

 Libraries (Ai^tronomical Obser\'atory, Botanic Garden, Bussey Institution, 

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

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

 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. 



The 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. 



DUNHEVED COLLEGE (LIMITED), 



LAUNCESTON, CORNWALL. 

 Seven hours from London. Separatk Bedrooms. Systematic Teaching 

 in SciENCB, 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, ist and 2nd B.Sc, Preliminary Scientific M. B., 

 Botany, 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, 

 ^uth Kensington. 



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 fresh-water Sponge (Spongilii 

 fluviaiilis), with sketch from life. He has also distributed Embryo 'I'rout, 

 Salmon, and Mussels, Young Tadpoles, CrLstatella and Plumatella just 

 emerging from the Statoblasts, btephanoceros, Floscularia, Melicerta, 

 Gicistes, &c. 



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

 is supplying. 



Price List of Specimens on application, with Stamped Addresse(' 

 Envelope. 



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

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

 Ectozoa), also sections of all Mammalian organs. 



WITHERNDEN SCHOOL, CATERHAM 



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

 Honours). Education on Natural Principles. A limited number of Pupils. 



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. 



HOW to MAKE a TELESCOPE, a MICRO- 



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

 GRAPH andPRINT aCARTE, see ILLUSTRATED CATALOGUE, 

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

 TRANSFER LANTERN SLIDES. 



J. LANCASTER & SON, Bull Street, Birmingham. 



The LANCASTER ELECTRIC LAMP, de- 

 vised by W. J. LANCASTER, F.C.S., F.R.A.S., &c., in three sizes. 

 No. I, to bum 3 hours, ;^2 as. ; No. 2, to burn 6 hours, {,^ 3s. ; largest 

 size, £5 5s. Set of 20 Quart Bunsen's Cells, £4 4^. Model Electri 

 Lamp and 10 Cells, £2 12s. 6d. 



ELECTRICAL & SCIENTIFIC APPARA- 

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

 from IS. 6d. New cheap Electric Lamps and Batteries. Induction 

 Coils and Frictional Machines are specialties. Electrical Bells, Fire 

 and Thief Alarms, and Automatic Switch-boards. Magnets, Covered 

 Wires, Screws, and all Materials. Apparatus for Science Teachers. 

 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 9*., 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, s«ch as may be procured 

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

 Callege, London." These Collections are supplied on the following 

 terms, in plain Mahogany Cabinets :^ ^ 



100 Specimens, in Cabinet, with 3 Trays m. ... m. £2 a o 



zoo Specimens, in Cabinet, with 5 Trays ... ~. ... 5 5 o 



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



400 Specimens, in Cabinet, with 13 Drawers .» ... ai o o 

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



SHEPPEY FOSSILS. 



W. H. SHRUBSOLE, Sheerness-on-Ska, 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 loi. Collections of 100 " good " specimens can be executed 

 without delay. 



"NOTES ON THE GEOLOGY OF SHEPPEY" post free on appli- 

 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 cf Rocks for the Microscope. Blowpipe Appa- 

 ratus and Materials of all kinds in Cases cr separately. New Patterns tf 

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



JAMES R. GREGORY, 



MUSEUM OF GEOLOGY, 



88, CHAR LOTTE STREET, FITZROY SQUARE. 

 THIN GLASS FOR MICROSCOPIC 



MOUNTING, of best quality. Cucles, 3*. 6d. per ounce ; Squares, 

 as. gd. ; post free 2a?. extra ; Ground edged Slips, 5/. per gross ;als* 

 other Mounting Materials and Objects prepared for motinting.— CHAS>. 

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



