XVUl 



NATURE 



{May 15, 1879 



WANTED, Clean Copies of NATURE, No. 472, 

 for November 14, 1878. Address — Office of 

 NATURE, 29, Bedford Street, Strand. 



MICROSCOPIC OBJECTS 



Of superlative perfection, illustrating Histology and eveiy branch of Micro- 

 scopy. Catalogue post free and gratis on application. 



PARIS UNIVERSAL EXHIBITION, 1878. 



Prize Medal awarded for Excellence, Variety, &'c. 

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



LINNEAN SOCIETY. 



Burlington House, Piccadilly, London, 13th May, 1879. 

 The ANNIVERSARY MEETING of the Linnean Society of London 

 will be held here on SATURDAY, the 24th of this month, at Three o'clock 

 precisely, for the Election of_a Council and Officers for the ensuing year. 



FREDERICK CURREY, Secretary. 



ASSISTANT at the ROYAL ALFRED 



OBSERVATORY, MAURITIUS.-Gentlemen desirous of becoming 

 Candidates will be required to possess qualifications in Mathematics, 

 Physics, and to have a knowledge of Phrtography. Salary: 4,cxx) 

 Rupees per annum, with free quarters. Duties : To assist the Director, 

 Dr. Meldrum, in meteorological and magnetic observations, and in 

 taking sun photograms. — Applications to be addressed to the Superin- 

 tendent of the Kew Observatory, Richmond, Surrey. 



ROYAL SOCIETY OF LITERATURE,— 



The Sijciety will meet on WEDNESDAY, May 21st, instead of May 

 iZth, at 8 P.M. precisely, when Sir Patrick de Colquhoun, Q.C, LL.D., 

 will read a Paper *' On the Authorship of Shakespear's Plays." 



W. S. W. VAUX, Secretary. 

 4, St. Martin's Place, Trafalgar Square, 1879. 



VICTORIA (PHILOSOPHICAL) INSTI- 



TUTE.— A Paper " On the Ethnology of the Pacific," by Rev. S. J. 

 Whitmee, will be read on the 19th M?y. 

 Papers for this Session, by Professcrs Hughes, F.R.S. (Camb.), W. Lee 

 (Glasgow Univ.), N. Porter, President of Yale, U.S.A., Mr. J. E. Howard, 

 F.R.S., &c. 



F. PETRIE, Sec. 

 House of the Institute, 7, Adelphi Terrace, 

 Charing Cross, London, W.C. 



INSTITUTE of CHEMISTRY.— The Presi- 



dent has offered two Prizes of ;^5o each for the two best original Inves- 

 tigations involving Gas Analyses. These Prizes will be open to Asso- 

 ciates, and to all persons (except Fellows of the Institute) who shall, 

 before the 31st December next, have qualified for the Associateship in 

 all respects short of passing the prescribed Practical Examination ; and 

 successful competition for these Prizes will be accepted in lieu of such 

 practical examinaiion. — Further information may be obtained on appli- 

 cation to the Secretary, Mr. C. E. Groves, Somerset House Terrace, 

 W.C. 



TUITION for the UNIVERSITIES, CIVIL 



Service, and Army. — Pupils prepared for the above by a Tutor in South 

 Kensington. Address — Tutor, Lamley's Library, Thurloe Place, 

 South Kensington. 



LIBRARY OF HARVARD UNIVERSITY. 

 CAMBRIDGE, MASS., U.S.A. 



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

 libraries (Astronomical Obser\'atory, Botanic Garden, Bussey Institution, 

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

 School), may be seat to the Agents, Messrs. TrIIbner & Co., 57 and 59, 

 Lucigate Hill, London. 

 JUSTIN WINSOR. Librarian. 



MIDLAND UNION OF NATURAL 

 HISTORY SOCIETIES. 



SECOND ANNUAL MEETING at LEICESTER, May 20 and 21, 

 1879, under the direction of the Leicester Literary and ^Philosophical 

 Society. 



CONVERSAZIONE 3.nd EXHIBITION of OBJECTS of SCIENCE 

 and ART, at the Town Museum, on Tuesday Evening, May 20. Tickets, 

 2S. 6d. 



GEOLOGICAL and BOTANICAL EXCURSIONS to CHARNWOOD 

 FOREST, on Wednesday, May 21st. Tickets, js. 6d. 



Tickets and Programmes are now ready, and may be obtained from the 

 Hon. Sec. to the Union, 



Mr. W. J. HARRISON, Town Museum, Leicester. 



BUNSEN BATTERY, 40 Cells, 7-inch Car- 



bons, £%, or ^s. 6d. per Cell. Grove, Trays, rc-pint Cells, ;C4- Bichro- 

 mate, 12 half-gallon in Case,/8. ELECTRIC LAMPS, best make, 

 3 and 5 Guineas, Coils, London made, i-inch spark, 701. Rotary 

 Engines. &c. Powerful HOLTZ ELECTTRICAL MACHINES, 

 special bargains, ;^4 to j£2o; guaranteed satisfactory and reliable. 

 Apparatus for Frictional > lectricity at very lowest prices. Lists post 

 free.— F. H, Brook, 107, Lorriraore Road, London, S.E. 



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 Spawn of Perch, with Illus- 

 tration. He has also distributed Vob'ox globaior, Pandorina, Nitella, Chsra, 

 Amcebae, Cristatella, Plumatella, Fredericella, Stephanoceros, Meliccrta, 

 Hydatina, Philodina, &c. He has also found the rare Rotifer named by 

 Dr. Hudson Melicerta tvbicolaria. 



Weekly announcements will be made in this place of organkms T. E. 

 is supplymg. 



Specimen Tube, One Shilling, post-free, 



Tivcnty-six Tubes in course of Six Months for Subscripti&n cf £1 is. 

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



MINEEALOGY AND GEOLOGY. ^ 



FINE AND INTERESTING GENICULATED CRYSTALS OF 



CASSITERITE, BRIITANY. 

 CUPRITES, NATIVE COPPERS, AND CHALCOTRICHITES, 



SERVIA. 

 MOLYBDATES OF LEAD, UTAH. 

 SILVER ORES FROM THE "EMMA" MINE. 

 CALCITES, CUMBERLAND. CERUSITES, UTAH. 

 TABLE OF HARDNESS, 2S. id. 

 FBIVAT£ LKSSONS AND £V£NINO CLASSES. 



SAMUEL HENSON, 

 277 (LcUeli-^a), STRAND, LONDON, W.C. 



A GENTLEMAN who is going on a Dredg- 



ing Cruise round the British Isles would be glad to meet another N:itu- 

 ralist who would be willing to accompany him during the whole or j-art 

 of the voyage. — For further particulars apply to C. P. Ogilvie, F.LS. 

 Sizeville House, Leiston, Suffolk. 



THIN GLASS FOR MICROSCOPIC 



MOUNTING, of best quaUty. Cu-cles, 35. 6d. per ounce ; Squares, 

 3f. gd. ; post free ^d. extra ; Ground edged Slips, 5J. per gross ; alto 

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

 PETIT. 151, High Street. Stoke Newington. N. 



DUNHEVED COLLEGE (LIMITED), 



LAUNCESTON, CORNWALU 

 Seven hours from London. Skparatk Bedrooms. Systematic Teaching 

 in SciENCB, Foreign Languages, and Univbrsity Courses. 

 Calendar post free from 



The Principal— BENJAMIN RALPH. LL.B. DnV 



ROYAL POLYTECHNIC— CLASSES for 



the preparation of Students for University Examination!, undo the 

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

 versity Matriculation, ist and and B.Sc, Prehminary Scientific MB., 

 Botany, Physiology, Chemistry. AU the work practical. 



GEOLOGY In the Preface to the Student's 



ELEMENTS of GEOLOGY, by Sir Charles Lyell, priee 9»., he says : 

 — " As it is impossible to enable the reader to recognise rocks and mine- 

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

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

 fr»m Mr. TENNANT (149, Strand), Teacher of Mineralogy at Kiig's 

 College, London." These Collections are supplied on the follov^ing 

 terms, in plain Mahogany Cabinets ; — 



JOG Specimens, in Cabinet, with 3 Trays «- ». ». jf 3 I o 

 aoo Specimens, in Cabinet, with 5 Trays ._ » » 5 5 o ; 

 300 Specimens, in Cabinet, with 9 Drawers «, ». 10 xo o 

 400 Specimens, in Cabinet, with 13 Drawers .- » 31 00 

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



DIAMONDS AND OTHER PRECIOUS 



STONES. Scientific opinion given as to GENUINEN ESS, PURI FY. 

 and VALUE.- Brvck Wright, 90, Great Russell Street, London, 



FO^R^ALE.— " Smyth's Cycle of Celestial 



Objects." The two vols., bound, price ;C4 lOf- — Address Rer. S, 

 Johnson, Upton-Helicns, Crediton. 



LABORATORY, 38, GRACECHURCH STREET, LONDON, EC. 



A. ANTHONY NESBIT, F.C.S., 



WATER ANALYST, 



Performs every description of Water Analysis on moderate terras. 



Properly cleansed bottles for the reception of samples sent to any part of 

 the Kingdom. 



ELECTRICAL, SCIENTIFIC, & PHOTO- 



GRAPHIC APPARATUS.— Electric Bells, Fire and Thief Alarms, 

 and Automatic Switches. Induction Coils. Frictional Machines. Lamps, 

 and Batteries. Microphones, Wires. Magnets, Carbons, and all Mate- 

 rials. Repairs and Alteratit ns. New Illustrated Descriptive Catalogue, 

 one Stamp. Cameras, Dry Plates, Sensitve Paper, and all Chemicals. 

 Photo. List free.— DALE & CRAMPTON, Manufacturing Opticians, 

 4, Little Britain, London, E.C. 



