1 



NATURE 



{Dec. 19, 1878 



NOTICE. 



Next zveek being Christinas Week, Nature 

 will be pziblished on TUESDAY. Adver- 

 tisements must be sent to the Office by noo7i 

 on Monday. 



29, BEDFORD STREET, STRAND. 

 MICROSCOPIC OBJECTS 



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

 scopy. Catalogue post free and gratis on application. 



PARIS UNIVERSAL EXHIBITION, 1878. 



Prize Mtdal aivarded for Excellence, Variety, ^c. 

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



UNIVERSITY OF LONDON. 



The REGISTRARSHIP of the University havin? become VACANT by 

 the resignation of Dr. Carpentek, Candidates for the Appointment are 

 invited to send in their Applications net later than February i, 1879. 



The Registrar is charged with the whole conduct of the business of the 

 University, under the direction of the Senate, and has the aid of an Assist- 

 ant Registrar and of an adequate Clerical Staff. 



The Salary of the Office will commence at ;£8co per annum, and will 

 increase by J^2^ annually until it reaches the maximum of ;^ 1,000 per 

 annum. 



The newly-appointed Registrar will be expected to enlcr upon his duties 

 en June i, 1879. 



Fiurther information may be obtained on application to the undersigned. 

 THOMAS DOUSE, Clerk to the Senate, 



University cf London, Burlington G.ardens, W., December 16, 1878. 



"HALL MARK" 

 FOR THERMOMETERS. 



The Kew Crmmittte cf the Royal Society hereby give Notice that after 

 this date all Thermon.eters verified at the Kew Observatory will be marked, 

 free of expense, with their monogram, "K.O.," iaterlaced, and a register 

 Kumber, in addition to the maker's number. 



Ihe Table of Errcis will be furnished as usual. 

 By order, 



G. M WHIPPLE, Superintendent. 

 Kew Observatory, December 13, 1878. 

 Scale of Charges for Verification, &c., post free on application. 



PRELIMINARY SCIENTIFIC EXAMINATION. 



UNIVERSITY OF LONDON. 



A Class in all the subjects for this Examination is held at St. Bartholo- 

 mew's Hospital and College from January to July, commencing on 

 January 20. 



The Class is open to others than Students of the Hospital. Fee for the 

 entire Course (inciud.ng practical instruction and materials) — To Students 

 of the Hospital, £,% ts. ; to others, £\o los. 



For particulars, arplication may be made personally or by letter to the 

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



MATRICULATION.— LONDON 

 UNIVERSITY. 



six months' Course. Fee, ^loioj. 



1ST BACHELOR OF SCIiiNCE and PRELIMINARY SCIENTIFIC 

 il.B. Six months' Course. Fee, ^10 10s. 



The above Classes will commence at the Royal Polytechnic, Regent 

 Street, in January next, under the direction of Edward B. Aveli.ng. D.Sc, 

 F.L.S. All work practical. 



UNIVERSITY OF LONDON. 



1ST M.B. AND PRELIMINARY SCIENTIFIC EXAMINATIONS 

 Classes in all the subjects required are now being formed at St. Thomas's 



Hospital Medical School, which are not confined to Students cf the 



Hospital. 



For particulars apply to Dr. Gillespie, Secretarj', at the Hospital. 



SUNDAY LECTURE SOCIETY.— LEC- 



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

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

 December 22. — Charles J. Plumptre, Esq. (Lecturer at King's Col- 

 lege, London), on "The Sacred Poelry of the Hebrews, Hindoos, and 

 ether Oriental Races." Members' Annual Subscription, £1. Pay- 

 ment at the Door — One Penny, Sixpence, and (reserved seats) One 

 Shilling. 



INSTITUTE of CHEMISTRY of GREAT 

 BRITAIN and IRELAND. 



An EXAMINATION in Practical Chemistry, in connection with the 

 Institute of Chemistry, will be held curing the last week of JANUARY 

 next. Examiner, Dr. W. J. Russell, F.R.S. 



Candidates can obtain further information on application to the Secretary, 

 Mr. Chaki es E. Groves, Somerset Hi.use Terrace, London, W.C. 



LIVING SPECIMENS FOR THE MICROSCOPE. 



THOMAS BOLTON, MICROSCOPIST'S and NATURALIST'b 

 STUDIO, 17, ANN STREET BIRMINGHAM. 

 RAPHIDIOPHRYS PALLIDA, 



The Freshwater Rhixopoda of F. Schuhc figured in Archiv far 

 iitikroskop. Anatomie, vol. x. Plate xxvi. fig. i. 



An interesting marine organism which Prof. E. Ray Lankester has recog- 

 n.sed as an ctnbryo of the Polyzoa, Alcyoniciiuiii. 



Also Hoscules, some fine Melicerta rbtgeiis, and Volvox globator, &c 

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



Weekly Announcements will be made in tlus ^ lace of Organisms ready 

 for sale. 



TELESCOPE for SALE.— A Fine Instru- 



ment, 3? Objective, on Parallactic Stand of great strength and firmness. 

 Screw moti'.ns ; several powers; in perfect condition. Price £2$. 

 Shows companion to Rigel, &c.— Address Polaris, Office of Nature, 

 Bedford Street, Co vent Garden, London. 



MR. JOHN HARRIS purposes to give, in 



the ASSEMBLY ROOM, TOWN HALL, KILBURN, TWO LEC- 

 TURES, the first on MONDAY, the isth, aad the second on TUES- 

 DAY, the 14th of January, "On the Circle and the Straight Line." 



Subject of the First Lecture : — Part First. 'J'/te Genesis of tlie Circle, 

 and the Priinajy Relationship of Cyclal Curvature to the Straight Line. 

 Part Second. The Fallacy in Legendre's Demonstration of tlu Ratio 

 of the Ciicie's Circtunfcrcnce to the Diameter.* 



Subject of the Second Lecture :— Part First. The Structural Har- 

 monics of the Circle's Octant. Part Second. Direct Demonstration by 

 Geometry of the actual Ratio of the Circle's Circumference to the 

 Diameter. 



* (Note. — The Immediate purpose of the first lecture will be to show mathe- 

 matically that the supposed demonstration upon which the presently ac- 

 cepted ratio of the circle's circumference to the diameter is based, is 

 erroneous ; making plainly evident the precise particular of the error, and 

 pointing out the manner ia which the error in the first instance originated, 

 and has been subsequently overlooked by mathematicians. In the second 

 lecture, conclusive demonstration by geometry of the true ratio wJl be 

 given.) 



Members of the Scientific Societies, professors of the various departments 

 of Science and others who may feel educationally interested In the subject, 

 will be, as far as practicable, formally invited to attend. 



EDUCATION. 



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

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

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



DUNHEVED COLLEGE (LIMITED), 



LAUNCESTON, CORNWALL. 



Seven hours from London. Separate Bedrooms. Systematic Teaching 

 in Science, Foreign Languages, and University Courses. 



Calendar pest free firom 

 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 

 Libraries (A; tronomical Obser\ atorj-. Botanic Garden, Bussey Institution, 

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

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

 LudgateHill, London. 

 ^ JUSTIN WINSOR, Librarian. 



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 Berners College, 44, Bemers 

 Street. W 



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. 



WITHERNDEN SCHOOL, CATERHAM 



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

 Honours). Edu cation on Natural Principles. A limited number of Pupils. 



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 mine- 

 rals at sight by aid of verbal descriptions or figures, he will do well to 

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

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

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

 terms, in plain Mahogany Cabinets : — 



ICO 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 10 10 o 



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



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



DIAMONDS AND OTHER PRECIOUS 



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

 Bryce Wright, 90, Great Russell Street, London, W.C. 



