Sept. 25, 1879J 



NATURE 



clxxv 



UNIVERSITY OF DURHAM COLLEGE 

 OF PHYSICAL SCIENCE. 



NEWCASTLE-UPON-TVNE. 

 NINTH SESSION. 



The Examination for Admission and for Exhibitions will commence on 

 MONDAY, the 6th of October. Three Exhibitions of the value of ;£i5 

 each will be awarded to entering Students who show suHicient merit in the 

 above Examinati^ms. Candidates for these Examinations must send in their 

 names to the Secretary on or befure SATURDAY, the 27th of September. 



Prospectus and Conditions to be had on application. 



THEO. WOOD BUNNING, Secretary. 



"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. 



Ihe 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., post free on application. 



ADVERTISER SEEKS EMPLOYMENT 



as Science Master or Assistant in a Chemical Laboratory. Address — 

 E. G. M., 2, Seymour Place, Clifton, Bristol. 



CITY and GUILDS of LONDON INSTI- 

 TUTE for the ADVANCEMENT of 

 TECHNICAL EDUCATION. 



TECHNOLOGICAL EXAMINATIONS. 

 The Programme for i83o is now ready and can be obtained gratis on appli- 

 cation to the Secretary, City and Guilds Institute, Mercer's Hall, London, 



E.a 

 DUNHEVED COLLEGE (LIMITED), 



LAUNCESTON, CORNWALL. 

 Seyen nours rrom London. Separate Bedrooms. Systematic Teaching 

 in Science, Foreign Languages, and University Courses. 

 Calendar pn*t free from 



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



ROYAL POLYTECHNIC— CLASSES for 



the preparation of Students for Univeriity Examinations, under the 

 direction of EDWARD B. AVELING, D.Sc, F.L.S. London Uni- 

 versity Matriculation, ist and 2nd B.Sc, Prehminary Scientific M.B., 

 Botany, Physiology, Chemistry. All the work practical. 



CASTLETON, DERBYSHIRE. 

 JOHN TYM 



Has largely added to his stock of Fossils and Minerals, and is now oSering 

 greatly improved Educational Collections at very Low Prices. 



For full particulars see his Catalogue, sent post free on application. 

 Postal Address^ 

 CASTLETON viA SHEFFIFXD. 



THE LONDON CLAY CLIFFS OF 



SHEPPEY have lately been wasting very rapidly, and a large quantity 

 ol interestmg Fossils have been washed out. A Representative Series of 

 100 Specimens, correctly named, will be sent, carriage paid, to London, 

 on receipt of lor. ; or one small Specimen each of 12 Species, post-free 

 for ij. 2//., by 



W. H. SHRUBSOLE, F.G.S., SheernessKjnSea. 



CIVIL SERVICE COMMISSION.— An 



Open Competition for one Situation as Assistant Naturalist in Dublin 

 M^iseum will be held in London on Tuesday, November 4, and following 

 days. Preliminary Examination on October 16; Age 18-24. to*" 

 Regulations and Forms of Apphcation, address— The Secretary, 

 London, S.W. 



DIAMONDS AND OTHER PRECIOUS 



STONth. M;ientific opinion givenai to GENUINENESS, PURITY 

 and VAt \^h..- Brycb Wright, 90, Great Russell Street, London. 



ASTRONOMICAL TELESCOPES.— 



CALVf R'S REFLECTING TELESCOPES of the highest excellence, 

 from sj-.nch to 36-inch aperture. sj-inch. with_ equatorial motion, 

 ;£i5 155.; 6-inch Equatorial, complete; Photo, with Calver's *' Hints 

 on Silvered (llass Reflecting Telescopes," 9 stamps.— G. CALVER. 

 F.R.A.S.. Hill House, Widford, Chelmsf..rd. 



F'jR SALE— A very fine i;)-iiich Etiuatoral, with Clock. 



MINERALOGY AND GEOLOGY. 



COLLECTIONS TO ILLUSTRATE THE ABOVE SCIENCES, 

 FROM 41. 



SINGLE SPECIMENS FROM ^d. 



AUGITE, ENSTATITE, GLAUCODOT, NEOTOKITE, CHON- 

 DRODITE, VERY FINE; NORWAY. 



PHENACITE, TOPAZ, ALE.XANDRITE, BERYL GROSSUL.\R, 

 SIBERIA. 



A SMALL QUANTITY OF THORITE WITH ORANGITE. 



BLOWPIPE CASES, HAMMERS AND CHISELS, AND CRYS- 

 TAL HOLDERS. 



PEIVATE LESSONS AND EVENING CLASSES. 



The next course of Ten Lessons will commence WEDNESDAY, October 

 8th, 7.30. Fee toy. 



Cataloguesfree. 



SAMUEL HENSON, 

 277 {Late Il3rt), STRAND, LONDON. W.C. 



On the 1st of every Month. 



THE JOURNAL OF BOTANY, 



BRITISH AND FOREIGN. 



New Series. Edited by Henry Trimen, M.B F.L.S. , British Museum ; 

 Assisted by S. Lh M. Moore, F.L.S., Ro.yal Herbarium, Kew. 



Contents. — Original Articles by leading Botanists. — Extracts, and 

 Nouces of Books and Memoirs. — Articles in J ournals. — Botanical News. — 

 Proceedings of Societies. 



Price ij. 3^. Subscription for One Year, payable in advance, laf. 



London: WEST, NEWMAN. & CO., 54, Hatton Garden, E.G. 



NORTH BRITISH AGRICULTURIST, 



Is the only Agricultural Journal in Scotland, and circulatei extensively 

 amongst landed proprietors, factors, farmera, farm-baitidTx, and others 

 interested in the management of landed property throughout Scotland and 

 the Northern Counties of England. 



The AGRICULTURIST has also a very considerable circulation on th« 

 Continent of Europe, America. Australia, and the Colonies. 



The AGRICULTURIST is pubUshed every Wednesday afternoon in 

 time for the evening mails, and contains Reports of all the principal British 

 and Irish Markets of the week, besides telegraphic reports of those held on 

 the day of pubUcation. 



The Veterinary Department i« edited by one of the leading Veterinarians 

 in the country, and is invaluable to the breeder and feeder as a guide to the 

 rearing of animals, and their treatment when labouring under disease. 



Full Reports are given of the Meetings of the Royal Agricultural Society 

 of England, the Royal Agricultural Society of Ireland, the Highland acd 

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For Advertisers addres^ng theoKelves to Farmers a better medium does 

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Price yi. By post, ^d. Annual Subscription, payable in advance, 14;. 



Office. — 377, High Street, Edinburgh. 



Post-office Orders payable to Charles Andenon, Jun., Edinburgh. 



Established 1843. 



On the ist of every Month, price One Shilling. 



THE ZOOLOGIST: 



A MONTHLY MAGAZINE OF NATURAL HISTORY. 



Third Series. Edited by J. E. Harting, F.L.S., F.Z.S., Member of the 

 British Ornithologists' Union ; contains — 



Original articles by well-known naturalists in every branch of zoology ; 

 habits of animals ; arrival and departure of migratory birds ; occurrence 

 of rare birds; distribution and migration of British fresh-water fish; new 

 or rare marine fish ; local aquaria ; British reptiles ; British land and fresh- 

 water moliusca, with remarks on the haunts and habits of the species; and 

 other matters of general interest to those who delight in natural history. 

 Reports of the Linnean, Zoological, and Entomological Societies. Reviews 

 of natural history books. Occasional translations from foreign xoological 

 journals of important and interesting articles in various branches of zoology. 

 There are occasional woodcuts. 



JOHN VAN VOORST, i. Paternoster Row. 



On the ist of every Month, price Sixpence. 



THE ENTOMOLOGIST: 



AN ILLUSTRATED JOURNAL OF BRITISH ENTOMOLOGY. 



Edited by John T. Carrington,' 



With the Aaiitance of 



John A Power, M.D. 



T. JBNNEB Wkir, F.L.S. 

 Whitk, M.D. 



Frbdbrick Bokd, F.Z.S. 

 Edward A. Fitch, F.L.S. 



F. Buchanan 



The Entomohgiit was founded for the purpose of diffusine informatloo 

 with regard to the science generally, and especially respecting Insects in- 

 jurious to Farm or Garden ; for Kecording the Capture of Rarities ; and 

 for Figuring Varieties. Monthly Lists ol Duplicates and Desiderata are 

 published. 



Interesting articles 00 all branches of the science by leading entomologists. 

 Especial attention is given to the printing of the Woodcut Illustrations, 

 which ara numerous. There are occasionally Colourkd Platbs. 



SIMPKIN, MARSHALL, and CO., Sutionen' Hall Court. 



