11 



NATURE 



{Nov. 7, 1878 



MICROSCOPIC OBJECTS 



It perfection, illustrating Histology and every bran 

 scopy. Catalogue post free and gratis on application. 



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



pfic 



PARIS UNIVERSAL EXHIBITION, 1878. 



E. WHEELER'S OBJECTS ARE IN THE BRITISH SECTION, GROUP 2, CLASS Vlll. 

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



THE LONDON ATHEN^TjW, 



26, SUFFOLK STREET, PALL MALL. 



This Institution being now established (500 Members having been ad- 

 mitted), an Admission Fee of Two Guineas will now be payable by new 

 Members. 



Annual Subscription : — Town Members, Two Guineas ; Country Members, 

 One Guinea. 



Members admitted in November do not pay the subscription for the 

 current year. 

 J. LOGAN LOBLEY, Secretary. 



SUNDAY LECTURE SOCIETY.— LEC- 



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

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

 November 10, 187S : — Moncure D. Conway, M.A., on "Voltaire." — 

 Members' Annual Subscription, ;{Ji. Payment at the Doer — One Penny, 

 Sixpence, and (reserved seats) One Shilhng. 



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. 



LIBRARY OF HARVARD UNIVERSITY, 

 CAMBRIDGE, MASS., U.S.A. 



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

 l^ibraries (Astronomical Observatory, Botanic Garden, Bussey Institution, 

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

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

 Ludgate Hill, London. 



JUSTIN WINSOR, Librarian. 



naturalT^iYstory agency. 



Collections of Insects, Bird and Mammal Skins, Eggs, Shells, Skeletons 

 &c., bought or sold on Commission. 



N.B. — Wanted Goc d Specimens of Native Implements of War. 

 A. H. JAMRACH, 218, East India Road, London, E. 



ENGLISH MECHANIC LIBRARY EDI- 



TION. — Complete Set, 26 Volumes ; handsomely bound in half maroon 

 calf, marbled edges. Price 15 Guineas. — Address The English Schcol 

 Book Association, 4, Ave Maria Lane, London, E.C. 



WITHERNDEN SCHOOL, CATERHAM 



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

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



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. 



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, Berners 

 Street. W 



ELECTRICAL APPARATUS for SALE^ 



CHEAP. — Nearly every experiment in frictional, and some voltaic. 

 Separately, or any assortment. Large and small Holtz Machines, 

 powerful Leyden Batteries, and other appliances, large and of special 

 excellence. Cylinder Machines with suitable size accessories. All 

 quite new, and fit for exhibition anywhere. — For list apply, letter only, 

 F.B., no. Cannon Street, London. 



ELECTRICAL and SCIENTIFIC APPA^ 



RATUS.-BEST WORKMANSHIP at VERY LOWEST PRICES. 

 Microphones most sensitive, \s. fxi. and 3-J. 6(/. Special Battery for 

 ditto, per cell, is. 6d. Telephonic Materials and Wires. New Automatic 

 Switchboards. Winter Electrical Machines and Induction Coils are 

 specialties. All can be seen in action. List, one Stamp. — DALE & 

 CRAMPTON, Electricians, 4, Little Britain, E.C. 



LANTERN SLIDES.— Size, 3I in. square ; 



i8j. per dozen. Skeletons, Skulls, &c., of Mammalia; Pond-life, In- 

 sects, &c., enlarged from Microscope. List for stamp. — JOHN 

 BURTON, F.R.M.S.. 50, Portland Road, Nottingham. 



THIN GLASS FOR MICROSCOPIC 



MOUNTING, of best quality. Circles, y. 6ci. per ounce ; Squares, 

 2J. gd. ; post free zd. extra ; Ground-edged Slips, 5^. per gross : also 

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

 P,:.TIT, isi, High Street, St_ke Newlngton, N. 



LIVING SPECIMENS_FOR THE MICROSCOPE. 



THOMAS BOLTON, 

 MICROSCOPISrS and NATURALIST'S STUDIO 

 17, ANN STREET BIRMINGHAM. 

 The beautiful Rotifers, 



STEPHANOCEROS EICHORNII 



AND 



LACINULARIA SOCIALIS. 



Several varieties of Polyzoa ; also of Infusuria, Vorticella, Amoeba, &c. ; 



also Chara, l^oh'ox globator, Protococcus, and Dermids. 

 Price List of Specimens on Application, with Stamped Addressed Envelope. 

 Weekly Announcements will be made in this place of Organisms ready 

 for sale. 



MINERALS, FOSSILS, AND ROCKS. 



COLLECTIONS IN CABINETS. 

 50 characteristic Specimens, io.r. ; 100 do., 2ar. ; 150 do., 30J. ; 200 do., 

 40J. ; 300 do., {,-3, : 400 do., Xw 500 do., £e,. Size of Specimens, about 

 2 square inches. "Guaranteed superior Collections." 

 N. B. — Carriage prepaid to any part of Great Britain. 

 Catalogues free. 



"THE POPULAR SCIENTIFIC POCKET CABINET SERIES," 

 25 Specimens, 2^. M. 



THOMAS J. DOWNING (MINERALOGIST), 



38, WHISKIN STREET, LONDON, E.C. 



SHEPPEY FOSSILS. 



W. H. SHRUBSOLE, Sheernsss-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 los. Collections of 100 " good " specimens can be executed 

 without delay. 



"NOTES ON THE GEOL'XY OF SHEPPEY" po.t free on appli- 

 cation. 



GEOLOGY.— In the Preface to the Student's 



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

 — "As it is impossible to enable the reader to recognise roclcs 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(i49, Strand), Teacher of .Mineralogy at King's 

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

 terms, in plain Mahogany Cabinets : — 



100 Specimens, in Cabinet, with 3 Trays {,1 a o 



2e» 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. 



MINERALOGY AND GEOLOGY. 



NEW PRICE LISTS AND CATALOGUES NOW READY OF 

 Elementary Collections of Minerals. 



,, „ Fossils. 



,, „ Rock Specimens. 



Sections of Rocks for the Microscope. 

 Drawings of New Shapes of Hammers. 

 Minerals for Chemical Purposes. 

 List of Varieties of Rocks. 

 Catalogue of Second-hand and New Books. 



JAMES R. GREGORY, 



EXTENSIVE GEOLOGICAL MUSEUM, 



88, CHARLOTTE STREET, FITZROY SQUARE. 

 EDISON'S MICROTASIMETERS. 



Having had an opportunity of examining EDISON'S MICROTASI- 

 METER with a view to taking measurement';, &c., we are prepared to 

 supply that instrument with improvements suggested by Prof. Barreit, for 

 £^ $s. ; also a cheaper form suitable for lecture or class demonstration, for 



GEORGE PRESCOTT & CO., 



jianufactureks of 



PHILOSOPHICAL INSTRUMENTS AND TUREET 



CLOCKS AND WATCHES, 



8, SOUTH KING STREET, DUBLIN. 



EUDOLPH KOENIG, 



(DR. PHIL.) 

 MANUFACTURER OF 



ACOUSTICAL INSTRUMENTS. 



TO ILLUSTRATE THE LAWS 



AND TO PRODUCE THE PHENOMENA OF SOUND. 



PARIS, 26, RUE DE PONTOISE. 



PRICE LISTS FREE. 



DIAMONDS AND OTHER PRECIOUS 



STONES. Scientific opinion given as ti PURITY and VALUE.— 

 B;;yce Wkight, 90, Great Russell Street, Lor.d.n, W.C. 



