NATURE 



\yune 12, 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. 



Prize Medal awarded for Excellence^ Variety ^ &=€, 

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



BRITISH ASSOCIATION FOR THE 

 ADVANCEMENT OF SCIENCE, 



22, ALBEMARLE STREET, W. 



The NEXT ANNUAL GENERAL MEETING will be held at 

 3HEFFIELD, commencing on WEDNESDAY, August 20. 



Presidhnt-Elect. 



Prof. G. J. ALLMAN, M.D., LL.D., F.R.S.L. and E., M.R.I.A. 

 Pres. L.S. 



NOTICE to CONTRIBUTORS of MEMOIRS.— Author are reminded 

 that, under an arrangement dating from 1871, the acceptance of Memoirs, 

 And the days on which they are to be read, are now, as far as possible, de- 

 termined by Organising Committees for the several Sections before the begin- 

 ning 0/ tlu Meeting. It has therefore become necessary, in order to give 

 an opportunity to the Committees of doing justice to the several communica- 

 t.cns, that each Author should prepare beforehand an Abstract of his 

 Memoir, of a length suitable for insertion in the published Transactions of 

 the Association, and the Council request that he wilt send it, together with 

 the original Memoir, by book-post, on or before July 15, addressed thus : — 

 ''General Secretaries, British Association, 22, Albemarle Street, London, 

 W. For Section " Authors who comply with this re- 

 quest, and whose Papers are accepted, will be furnished before the Meeting 

 with printed copies of their Reports or Abstracts. If it should be inconve- 

 nient to the Author that his Paper should be read on any particular days, he 

 is requested to send information thereof to the Secretaries in a separate 

 note. 



No Report, Paper, or Abstract can be inserted in the Report of the Asso- 

 ciation unless it is in the Assistant- Secretary's hands before the conclusion 

 of the Meeting. 



J. E. H. GORDON, Assistant-Secretary. 



VICTORIA (PHILOSOPHICAL) INSTI- 

 TUTE.— The ANNUAL MEETING will be held at 8 o'clock, June 

 16th, at the House of the Society of Arts (by kind permission of that 

 Society). The President in the Chair. 

 The Address will be dehvered by Dr. Radcliffe. 



*it* Those wishing to join as Members or Associates should send in their 

 names as soon as possible before the Annual Meeting, so as to insure the 

 special privileges accorded to those joining this year. 

 Particulars sent on application. 



F. PETRIE, Secretary to the Council. 



House of the Institute, 7, Adelphi Terrace, 

 London, W.C 



OWENS COLLEGE, MANCHESTER. 



The Council propose to appoint a separate Professor of Zoology. Candi- 

 dates are invited to send in Applications and Testimonials under cover to the 

 Registrar not later than the 28th June. _ 



Details as to the duties and emoluments of the office may be obtamed on 

 application to the Principal, Dr. Greenwood. 



J. HOLME NICHOLSON, Registrar. 



The COUNCIL of the YORKSHIRE COL- 

 LEGE, LEEDS, invite Applications for the post of ASSISTANT 

 LECTURER in CLASSICS and MATHEMATICS. Stipend, ;Cioo 

 a year, and a share of certain tutorial fees. Duties to commence Octo- 

 ber 1st. Preference will be given to Graduates of the University of 

 London. Applications, accompanied by copies of testimonials, to be 

 sent on or before Friday, June 27th, to the Secretary, from whom 

 further informaticn as to duties may be obtained. 



Just published, price f,i* 



PHILOSOPHICAL TRANSACTIONS. 



EXTRA VOLUME. 



■1 he FELLOWS of the ROYAL SOCI ETY are hereby informed that the 

 PHILOSOPHICAL TRANSACTIONS, Vol. 168, contain:iig the Reports 

 cf the Naturalists attached to the Transit of Venus Expediticns, is now 

 pubhshed, and ready for delivery on application at the Office of the Society 

 m Kurlington House, daily, between the hours of 10 and ^. 



Suld by HAERltON & Sons, St. Martin's Lane. 



WALTER WHITE, Assistant Secretary R.S. 



Burlington House. 



LIBRARY OF HARVARD UNIVERSITY, 

 CAMBRIDGE, MASS., U.S.A. 



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

 Libraries (Astronomical Observatory, Botanic Garden, Bussey Institution, 

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

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

 Lud£aieHiU, London. 

 •• T. JUSTIN WINSOR, Libranac. 



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 specimens cf Urogiena 

 volvoXf with drawing and description. He has ais-i distributed Volvox 

 globator, CAosictmm.C/iceiofharaele^ans, Drnparnaldia ^lomerata^ Kitella, 

 Chara, Vallisneria, Amceba:, VorticelUdae, Hydrx, Cristatella, Melicerta. 

 Hydatina, Brachionus, &c. 



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

 is supplymg. 



Specimen Tube, One Shilling, post-free, 



Twenty-six Tubes in course of Six Montfis for Subscription of £i is. 

 Price List of Specimens on application, with stamped addressed envelope. 



"royal institution of great 



BRITAIN, 



ALBEMARLE STREET, PICCADILLY, W. 



The next ACTON I AN 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 ITieory of Evolution." The Prize is 

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

 their judgment ^hall think proper. 



Competitors for the Prize are reqrested 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, Secretary R. I. 



ASTRONOMICAL ASSISTANT. — The 



Post of ASSISTANT in the Observaton', Birr Castle, is VACANT.— 

 Applications, stating qualifications, age, &c,, to be made during thf: next 

 four weeks, to the Earl of Rosse, i, Prince's Gate, London, S.W. 

 ;£20o per annum. 



SECRETARY WANTED.— The Committee 



of the PERRY BARR INSTITUTE. Birmingham, are desirous of 

 meeting with a Gentleman who would be able to employ the wh >Ie of 

 his time in the capacity of SECRETARY of the Institute. Payment 

 will be partly by Salary and partly by Commission. Written applica- 

 tion, with not more than three testimonials, to be addressed to W. J. 

 Clarke, Chairman of the Institute, Perry Barr. 



DURING the RECENT GALES a large 



quantity of interesting FOSSILS have been washed out of the London 

 Clay Cliffs of Sheppey. A representative Series of 100 Specimens, 

 correctly named, will be sent carriage paid to London on receipt of los. 

 by W. H. SHRUBSOLE, F.G.S., Sheerness-on-Sea. 



FOR SALE.— A very fine SPECTROSCOPE 



of two large prism5;, micrometers, and all necessary apparatus cf the 

 best construction ; made for astronomical faint spectra, but suitabJe for 

 many other branches of study. Has never been used. Original cost, 

 ;^5o ; will be sold for ^£15. To be seen at the maker's, Mr. J. Bk nvN- 

 iNG, 63, Strand. 



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 Malriculation, ist and and 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, ITiurloe Place, 

 South Kensington. 



DUNHEVED COLLEGE (LIMITED), 



LAUNCESTON, CORNWALL. 

 Seven hours from London. Separate Bedrooms. Systematic Teaching 

 in Science, Foreign Languages, and University Courses. 

 Calendar post free irom 



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



Mr. TENNANT, F.G.S., Professor of 



Mineralogy and Geology, Mineralogist by Appointment to Her Majesty 

 and the Baroness Burdett-Coutts, 149, Strand, London, W.C., having 

 been fifty years in business, contemplates shortly RETIRING, and 

 offers for SALE several of his extensive COLLECTIONS of Minerals. 

 Rocks, and Fossils. They are well adapted for first-class Educational 

 Establishments, Provincial or Colonial Museums, or for the Private 

 Study of any Scientific Person wishing to become acquainted with the 

 abo^e-mentioned Sciences. From ;£i, 000 to 5,000 Guineas. Students*" 

 Collections at 2, 5, 10, 20, to 50 Guineas. 



I 



THIN GLASS FOR MICROSCOPICj 



MOUNTING, of best quality. Circles, jj. 6ti. p«r ounce ; Squ.Tre»J 

 2J. gj. ; post free arf. extra ; Ground edged Slips, 51. per gross ; alir" 

 other Mounting Materials and Objects prepared for mounting.— CHAS 

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



