April I, 1879] 



NATURE 



clxxiii 



LIBRARY OF HARVARD UNIVERSITY, 

 CAMBRIDGE, MASS., U.S.A. 



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

 Libraries (A-tronomical Obsenatory, Botanic Garden, Bussey Insutution, 

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

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

 Ludgate Hill. London. 



JUSTIN WINSOR, Librarian. 



^VITHERNDEN SCHOOL, CATERHAM 



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

 HoooursX Education on Natural Principles. A limited number of Pupils. 



\ LABORATORY, 38, GRACECHURCH STREET, LONDON, E.C 



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



WATER ANALYST, 



Performs every description of ArVater Analysis on moderate terms. 



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

 the Kingdom. 



MINERALOGY AND GEOLOGY. 



A New List of Collections of Fossils, Minerals, and Rocks now ready, 

 including Special Collections to illustrate the various Text-books, in 

 Cabinets- List cf Sections cf Roclcs for the Microscope. Blowpipe Appa- 

 ratus and Watenals of all kinds in Cases cr separately. New Patterns cf 

 Geological Hammers, n-ith prices. List of New and Second-hand Books of 



JAMES R. GREGORY, 



MUSEUM OF GEOLOGY, 



88, CHARLOTTE STREET, FITZROY SQUARE. 



THIN GLASS FOR MICROSCOPIC 



MOUNTING, of best quality, (^les, 51. td. per oimce ; Squares, 

 2J. (jd. ; post free zd. extra ; Ground edged Slips, 51. per gross : also 

 ether Moimting Materials and Objects prepared for mounting.— CH AS- 

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



GEOLOGY.— In the Preface to the Student's 



ELEMENTS of GEOLOGY, by Sir Charles Lyell, price jr., he says : 

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

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

 obtain a well arranged collection of sx>ecimens, sach as may be prooored 

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

 Cellege, London." These Collections are supplied on ue following 

 terms, in plain Mahogany Cabinets : — 



100 Specimens, in Cabinet, with 3 Trays .««>>. ^^ s o 

 aoo Specimens, in Cabinet, with 5 Trays .~ m» m. 5 5 o 

 300 Specimens, in Cabinet, with 9 Drawers •» m. 10 10 o 

 400 Specimens, in Cabinet, with 13 Drawers ... ~. 21 00 

 More extensire Collections at 5* to 5,000 Guineas each. 



SHEPPEY FOSSILS. 



W. H. SHRUBSOLE, Sheernkss-on-Sba, respectfully intimates that 

 the app^ recently made by him has been so heartily rei>ponded to, that he 

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



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

 without delay, 



•; NOTES ON THE GEOLOGY OF SHEPPEY " post free on aM>B- 

 cation. 



ELECTRICAL & SCIENTIFIC APPARA- 



TUS for AMATEURS and the TRADE.— Microphones of every form, 

 from ir. td. New cheap Electric Lamps and Batteries. Induction 

 Cc»Is and Frictional Machines are specialties. Electrical Bells, Fire 

 and Thief Alarms, and Automatic Swicch-boards. Magnets, Covered 

 Wires, Screws, and all Materials. Apparatus for Science Teachers. 

 Illustrated. Catalogue, one stamp. Repairs and Alterations. Appara* 

 tus made to sketch.— DALE & CRAMPTON, Manufacturing Elec- 

 tricians, 4, Littie Britain, E.C 



DIAMONDS IN MATRIX. 



R. C. NOCKOLD, Diamond and Oriental Stone Cutter and Dealer, has 

 for sale specimens of the above ; also Cut Precious Stones in all Colours. 

 12, FRITH STREET, SOHO, W. 



MINERALOGY AND GEOLOGY. 



24 assorted Minerals for Blowpipe Experiments, with printed List, in 

 Pocket Case, 2J. ; 24 ditto (second scries), ax. ; Mob's Scale of Hardness 

 of Minerals, 9 Specimens with File and streak tablet in a convenient Case, 

 4r. : von Kohbell's Scale of FusibiLty of Minerals, 6 Specimens in Pcxket 

 Case, 2J. ; Geological Collecting Bag complete, 45. ; Ditto Hammer 

 Holder and Strap, ar. Geological Charts, Books, Hammers, Chisels, 

 Leases, Add Bottles, Glass-capped Boxes, Cement for Mounting and Re- 

 pairing Fossils, Tablets, Card Trays, &c., &c. Minerals, Fossils, and 

 Rocks, sent on approval and for selection to all parts of the world. 

 THOMAS J. DOWNING, 

 38: WHISKIN STREET, LONDON, E.a 



CAT-\LOGUES FREE. 



MINERALOGY AND GEOLOGY. 



COLLECTIONS ILLUSTRATING ABOVE SCIENCES FROM ^I. 



ALSO SINGLE SPECIMENS AT VERY REASONABLE PRICES. 



POLISHED STALAGMITE AND FLUOR SP.AR. 



SCRAPS FOR BLOWPIPES ir. per doz. bjxes. 



TABLE OF HARDNESS, sj. &/. 



GEOLOGICAL CHISELS AND HAMMERS. 



PKIVATE LESSONS AND EVENING CLASSES- 



SAMUEL HENSON, 

 277 {Latewyi), STRAND, LONDON, W.C. 



VoL II., Pitt 2, April, 1879, 4 Plates, ys. 



JOURNAL OF THE ROYAL MICROSCO- 

 PICAL SOCIETY. 



Containing its Transactions and Proceed ngs. with other infonnatloa relat- 

 ing tj Invertebrata and Cryptogamia, E-nbryoHgy, Histolo^, Microso>py, 

 &C. Edited, under the direction o^ the Pubhcauon Committee, by Feank 

 Crisp, LL.B., B-A-, F.L.S. 



TTte President's Address, by H. J. Slack, F G.S. — Observations on Dtu- 

 tylocalyx pumicens (Stuchburg) with a description of a new Variety, D. 

 stuchbury, by W. J.jSollas, M.A., F.G.S. (4 Plates).— The Aperture Question, 

 by J. Mayall, jun-. F.R,A.S. 



Cells and their Ai^tal Phenomena. — Oil Immersion Objectives. — Poison 

 Apparatus and Anal Glands of Ants. — Degenerarion of Visual Organs in 

 Arachnida.— Ascent and Grculaiim of Sap. — The Tomopteridac. — New 

 Rotifer, Tetraptertm volitaru. — Development of SpongiUa _flieviatilis. — 

 Movements of Diatoms ; and many other Notes of recent Biological and 

 Microscopical Investigations. 



Bibliography of English and Foreign B^oks. — Journals and Transactions. 

 — Proceedings of the Society. 



WILLIAMS & NORGATE, London and Edinbaigh. 



THE 



MONTHLY JOURNAL OF SCIENCE 



AND AVNALS OF 



BIOLOGY, ASTRONOMY, GEOLOGY, INDUSTRI.\L ARTS. 

 M.\NUFACTURES, AND TECHNOLOGY. 



Edited by WILLIAM CROOKES. F.R.S-, &c^ 



On Monday next. No. LXIV., April. 1879. 

 Price ONE SHILLING and SIXPENCE. 



CbNTESTS : — 



I. Is Nature Perfect? 



II. Thoughts on our Conceptions of Physical Law. By Prof. Francis 

 E. Nipher. 

 III. The Old Stannaries of th? West of England. By James Quick. 

 rV. A New Theory of Terrestrial Magnetism. By Profs. Perry and 

 Ayrton. 

 V. The Jablochkoff Candle: its Practical Results in London. By 

 Charles W. Quin. 

 VI. The Tornado in Wisconsin in 1878. 

 VII. The Electric Light for India. 

 VIII. Painless Death- 

 Correspondence- — The Sea Serpent — Sp'-der's Web for Micrometers. — The 

 Senses of the Lower Animals- — Optical Illusions. 

 Reviews of Books — Science Notes, &c. , &c. 

 London: 3, H«rse-Shoe Court, Ludgate Hill, E-C. 



MIND, 



A QUARTERLY REVIEW OF PSYCHOLOGY AND PHILOSOPHY. 



No. 14, APRIL, 1879, Price jr. 



Annual Subscription, izi.. Post Fkeb. 



I. — Laura Bridgman. By G- Stanley HalL 



II. — Harmony of Colours. By James Sully. 

 Ill- — The Stanhope Demonstrator. By Rev. Robert Harlev, F.R.S. 

 IV.— Jshn Stuart MiU (I.). By Prof Bam. 



V. — Definition De Jure and De Facto. By Alfred Sidgwick. 

 VI. — The Personal Aspect of Responsibility. By L. S. Bevington. 

 Notes and Discussions, Critical Notices, &c. 



WILLIAMS & NORGATE, 14, Henrietta Stieet, Covent Garden, London ; 

 and 20, South Frederick Street, Edinburgh. 



THE JOURNAL OF BOTANY, 



BRITISH AND FOREIGN. 



Edited by Hkhkt Tsimem, M-B., F.L.S., British Museum; assisted by 

 S. leU. Mocks, F L.S., Royal Herbarium, Kew. 



On and after January i, 1878. the JOURNAL OF BOTANY wffl be 

 printed and published by T. P. Nbwman, 32, Botolph Lane, E.C , to whom 

 Subscriptions for 187S should be sent The volume for 1877 (price i6j. td., 

 bound in cloth), covers for the volume (price is. \ and bacjc Numbers, can 

 also be obtained of Mr. Newman. Tbr Annual Subscription, payable in 

 advance, is lar., post free in the United Kingdom. Pogt-Ofiice Orders 

 payable at EASTCHEAP. 



