NATURE 



\Nov. 14, 1878 



MICROSCOPIC OBJECTS 



Of fupcrlative perfection, illustrating Histology and every branch cf Micro- 

 scopy. Catalogue post free and gratis on application. 



PARIS UNIVERSAL EXHIBITION, 1878. 



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

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



SUNDAY LECTURE SOCIETY.— LEC- 



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

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

 November 17, 1878 :— Clair J. Grece, Esq., LL.D., on "The Philo- 

 sophy of Heraclitus: Greek and Modern Cosmical Theories compared." 

 Members' Annual Subscription, ;Ci. Payment at the Door — One Penny, 

 Sixpence, and (reserved seats) One Shilling. 



COMMUNICATIONS INVITED respect- 



ing SJMNAMBULIS.M, of Facts experienced, and References to 

 Authentic Instances and Accurate Observations of the Phenomena, for 

 the use of 



THE PSYCHOLOGICAL SOCIETY OF GREAT BRITAIN, 

 to be sent, confidentially, before the 20th instant, to W. H. COFFIN, 

 SCIENTIFIC CLUB, 7, Savile Row, London, W. 



DUNHEVED COLLEGE (LIMITED), 



LAUNCESTON, CORNWALL. 



Seven hours from London. Separate Bedrooms. Systematic Teaching 

 in SciEN'CE, Foreign Languages, and University Courses. 



Calendar post free from 

 The Principal— BENJAMIN RALPH. LL.B. Dub. 



LIBRARY OP Harvard itniversity, 



CAMBRIDGE, MASS., U.S.A. 



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

 Libraries (A tronomical Observatory, Botanic Garden, Bussey Institution, 

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

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

 LudgaieHill, London. 



JUSTIN WINSOR, Librarian. 



EDUCATION. 



REV. W. TUCKWELL. late Head-Master of TAUNTON COLLEGE 

 SCHOOL, and Fellow of New College, Oxford, takes a FEW YOUNG 

 BjYS as PUPILS.— Address STOCKTON RECTORY, near Rugby. 



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., 

 Rotany, 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 Toadies preparing for the various Examining Boards. Fees 

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

 Street. W 



WITHERNDEN SCHOOL, CATERHAM 



V.\LLEY, SURREY.— Principal, Mr. C. H. LAKE, B.A. Lond. (in 

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



THE LONDON ATHEN^UM, 



26, SUFFOLK STREET, PALL MALL. 

 Th's Institution being now established (500 Members having been ad- 

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

 Members. 



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

 One Guinea. 



Members ad.-nitted in November do not pay the subscription for the 

 current year. 



J. LOGAN LOBLEY, Secretary. 



To LEADING SCIENTIFIC &LITERARY 



MEX. — An old-estab'ished Firm., who are extending their Publishing 

 Department, are prepared to undertake the Publication of a few Stan- 

 darj Works in Science and General Literature, upon liberal terms. All 

 commun caticns in reply to this advertisement will be treated as strictly 

 confidential, and should be addressed in the first instance, by letter only, 

 to Dclta, Londcn Institution, Finsbury Circus, E.C. 



ELECTRICAL and SCIENTIFIC APPA- 



KATUS.-BEST W( )RKMANSHIP at LOWEST PRICES.— 

 Induction Coils and Electric Machines. New Electric lamp, i\s. 

 Bells with Automatic Switches and Batteries for Telephones, complete, 

 50J. Microphones most sensitive, 3^. td. ; Battery for ditto, per cell, 

 IS. (xi. Electric Bells, Fire and Thief Alarms, Telephonic Materials, 

 Wires, Carbons, Batteries, &c. Catalogues one stamp.— DALE & 

 CRAMPToN, Electricians, 4, Little Britain, London. E.C. 



ELECTRICAL APPARATUS for SALE, 



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

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

 powerful Leyden Batteries, and other appliances, lar^e and cf special 

 excellence. Cylinder Machines with suitable size accessories. All 

 cuite ne V, and fit for exhibition anywhere. — For list apply, letter only, 

 F.B., no, Ca.nntn Street, London. 



LIVING 8PECIMENS_P0R THE MICROSCOPE. 



THOMAS BOLTON, 

 MICROSCOPISrS and NATURALIST'S STUDIO 

 17, ANN STREET BIRMINGHAM. 

 The beautiful Rotifers, 



STEPHAN0CER03 EICHORNII 



AND 



LACINULARIA SOCIALIS. 



Several varieties of Polyzoa ; also of Infusoria, Vorticella, Amoeba, S-C. P 



also Chara, VoItox globaior, Protococcus, and Dermids. 

 Price List of Specimens on Amplication, with Stamped Addressed En\el pe. 

 Weekly Announcements will be made in this place of Organisms ready 

 for 5ale. 



EQUATORIAL TELESCOPE & OBSER- 



VATORY.— For Sale, Eo.uatorial Telescope, with 7-nch Object-glass, 

 by Merz ; the Stand, with clock fallowing moti n, made by Brown ng. 

 Capital Observatorj' \_n feet diameter), with revolv.ng Dr me and Trai.s.t- 

 room attached. Transit. Instrument for the same ; full Battery of Eye- 

 pieces, and best Star Spectroscope, by Browning. The whole in perfect 

 condition, and to be sold for the very low sum of £220. — Af ply to 

 John Browning, 63, Strand, London, W.C. 



WANTED, a Second-hand ASTRONOmY- 



CAL REFRACTING TELESCOPE of about 8 inches aperture and 

 10 feet focal length, equatorially mounted to suit any latitude from 10° 

 to 60', and prov.ded with Clock-work ard all the ufual Eye-pieces to 

 about 8oo diameters, and position and parallel Wire Micrometers. 

 Before purchasing, a guarantee from the original makers will be re- 

 quired, stating that the instrument is in perfect working order, and 

 that the object-glass is of first-ra'.e excellence and as good as r.ew. — 

 Apply, by letter only, giving price, maker's name, and very full particu- 

 lars, to Tho.mas p. Bigg-Wtiher, Esq., Mcntague House, Surbiton 

 Hill, Surbiton. 



NATURAL HISTORY AGENCY. 



Collections of Insects, Bird and Mammal Skins, Eggs, Shells, Skeleton* 

 &c., bought or sold on Ciommission. 



N.B. — Wanted Good Specimens of Native Implements of War. 

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



THIN GLASS FOR MICROSCOPIC! 



MOUNTING, of best quality. Circles, 3.'. 6<f. per ounce ; Squares,! 

 ■2S. gd. ; post free ^d. extra ; Ground-edged Slips, 5 J. per gross : also! 

 other Mounting Materials and Objects prepared for mounting.- CHAS" 

 PETIT. 151, Hi^h Str^t. Stoke Newington. N. 



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 mira 

 rals at sight by aid af verbal descriptions or figures, he will do well t^ 

 obtain a well arranged collection of specimens, such as may be procured' 

 from Mr. TENNANT(i49, Strand), Teacher of Mineralogy at King's 

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

 terms, in plain Mahogany Cabinets : — 



100 Specimens, in Cabinet, with 3 Trays £2 2 o 



200 Specimens, in Cabinet, with 5 Trays 5 5° 



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



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



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



SHEPPEY FOSSILS. 



W. H. SHRUBSOLE, Sheerness-on-Sea, respectfully intimates that 

 the appeal recently made by him has been so heartily responded to, ti'iat he 

 cannot receive any mure orders for " extra selected "specimens at present. 



Orders for zos. Collections of 100 "good" specimens can be executed 

 without delay. 



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

 cation. _^________^ 



MINERALS, FOSSILS, AND ROCKS. 



COLLECTIONS IN CABINETS. 



50 characteristic Specimens, loi. ; 100 do., 20s. ; 150 do., 30*. ; 200 do., 

 401. ; 300 do., £-i,: 400 do., £^; 500 do., £$■ 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, 2J. 6d. 



THOMAS J. DOWNING (MINERALOGIST), 



3«, WHISKIN STREET. LONDON, E.C. 



MINERALOGY AND GEOLOGY. 



NEW PRICE LISTS AND CATALOGUES NOW READY OK 

 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, CH.aRLOTTE street, FITZROY SQUARE. 



