SCIENCE- 



[VoL. XXI. No. 539 



Probably you take 



THE ELECTRICAL ENGINEER. 



Most people interested in Electricity 

 ^ do. 



If you do notj now is a good time to 

 begin. 



It is published every Wednesday. 



Subscription, $3.00 per year. 



You can try it three months for fifty 

 cents. 



Address: 



THE ELECTRICAL ENGINEER, 



203 Broadway, 



New York, N. Y. 



Every reailer of "Science" should sub- 

 scribe for the 



AMERICAN ARCHITECT, 



TBE ODDEST AND BEST 



Architectural publication in the country. 

 Interesting articles on architecture. Sani- 

 tation, ArchaBology, Decoration, etc., by the 

 ablest writers. Richly illustrated. Issued 

 weekly. Send stamp for specimen copy to 

 the publishers, 



Ticknor & Co., 211 Tremont St., Boston. 



Neivspaper Clippings. 25,000 in Stock. 

 'What do yoo want? Let ns know. We 

 can etnpply yon. 'The Clemens News 

 Agency, Box 2329, San Francisco, Cal. 



BRENTANO'S, 



Publishers^ Importers, Booksellers. 



We make a specialty of technical works in all 

 branches of science, and in all languages. 



Subscriptions taken for all American and foreign 

 scientific periodicals. 



Our Paris and London branches enable us to im- 

 port at shortest notice and lowest prices. Reports 

 OF Scientific Societies, Monographs, Government 

 Reports, etc. Correspondence solicited. 



'^^^ All books reviewed in Science can be ordered 

 from us. 



Send for a Sample Copy of Book Chat. A Month- 

 ly Index of the Periodical Literature of the World. 

 $1.00 per year, 



BRENTANO'S, Union Square, New York, 



Chicago, Washington, London, Paris. 



AMERICAN SCIENCE SERIES. 



Barker's Physics. 



Advanced course 



Remsen's Chemistry. 3 courses 



Packard's Zoology. 3 courses 



Martin's Human Body. 3 courses. 



Walker's Political Economy. 3 coui 



Newcomb & Holden's Astronomy. 2 courses, 



Bessey''s Botany. 2 courses, 



James''s Psychology. 2 courses, 

 Sedgwick & Wilson's Biology. 



HENRY HOLT & CO., N.Y. 



BUILDING 

 BOOKS. 



DRAWING 

 INSTRUMENTS. 



1893 Catalogue 



of Books on Building, 

 Painting, and Decorating, 

 also Catalogue of Draw- 

 ing Instruments and Ma- 

 terials, sent free on appli- 

 cation to 



IVm. T. Comstock, 



23 Warren St., New York, 



PCDMAMIA -^ monthly magazine for the study 

 uCnInAlll A of the German language and litera- 

 ture, is highly recommended by college professors 

 and the press as '"the best effort yet made to assist 

 the student of German, and to interest him in his 

 pursuit.''' Its Beginners' Corner furnishes every 

 year a complete and interesting course in German 

 grammar. S2 a year. Single copies 20 cents. P. O. 

 Box 151. Manchester, N. H. 



What Our Subscribers Say. 



Dr. Edward Brooks, Philadelphia: . 



"I especially admire the conservative ground of the Journal while advocating those things that 

 make for real progress in Education." 

 Mrs. D. H. R. Goodale, Amherst, Mass.: 



"If the teachers of the land do not give the Journal a hearty support, they are certainly very 

 blind in their day and generation. '■" 

 A Kansas Sitbscriber Says : 



" Of the number of papers which I take the Journal is the most welcome visitor." 

 From a New York Subscriber : 



" Inclosed is a Post Office order for two dollar and fifty cents ($2.50), to renew subscription fer 

 Journal of Education. Must have the paper— 'tis necessary for my health and happiness." 

 Rural Subscriber in Mass.: 



'•I find the Journal a most profitable and interesting paper, 'an ever present help' in time of 

 school perplexities." 



JOURNAL OF EDUCATION. 



A. E. WINSHIP, Editor. 

 WEEKLY, »3.60 A YEAR. IN CLUBS OF THREE OR MORE, «3.00 A YEAR. 



For $1.00 we will send you the J^ournal from now to Jan., 1894, provided you mention 

 this paper. 



New England Publishing Co., 3 Somerset Street, Boston, Mass. 



The Boston Medical and 

 Surgical Journal. 



BOSTON, _ _ _ _ MASSACHUSETTS. 



A FIRST-CLASS WEEKLY MEDICAL NEWSPAPER. ESTABLISHED 1828. 



Terms of Subscription : In the United States, and to Canada and Mexico, $5 00 a year in ad 

 vance. To Foreign Countries embraced in the Universal Postal Union, $1.56 a year additional. Single 

 numbers, 15c. Ten consecutive numbers free by mail on receipt of $1.00. 



This Journal circulates chiefly through the New England States, and is seen hj the great majority 

 of the profession in that important district. As a means of reaching physicians it is unequalled. 



It is under the editorial management of Dr. George B. Shattuck, assisted by a large staff of compe- 

 tent coadjutors. Subscriptions and advertisements received by the undersigned, to whom remittances 

 by mail should be sent by money-order, draft or registered letter. 



DAMEELL & UFHAM, 283 Washington Street, Boston, Mass. 



THE WINNIPEG COUNTRY; 



ROUGHING IT WITH AN ECLIPSE PARTY. 



A, ROCHESTER FEI.LOVV, 



(S. H. SCUDDER.) 



With thirty-two Illustrations and a Map. 

 13°. $1.50. 



"This is a sprightly narrative of personal inci 

 dent. The book will be a pleasant reminder to 

 many of rough experiences on a frontier which Is 

 rapidly receding."— Bosf on Transcript. 



" The picture of our desolate North-western terri- 

 tory twenty-flve years ago, in contrast with its 

 civilized aspect to-day, and the pleasant features of 

 the writer's style, constitute the claims of his little 

 book to present attention." — The Dial. 



N. D. C. H0DGEs7l74 Broadway, N. Y. 



5end 25 Cents 



For a 3-months' trial subscription to 



THE nOTHER'5 



NURSERY GUIDE, 



The recognized authority on the care of infants 

 and children. $2 per year. 



Health, Education, Dress, Pastimes. 



alue."— A^. Y. Herald. 



BABYHOOD PUBLISHING CO., Box 3123, N. Y. 



Pennsylvania Bedford Springs Mineral Water 



For Liver, Kidney and Bladder Troubles. 



For Gravel, Gall Stones, Jaundice. 



For Dyspepsia, Rheumatism and Gout. 



For Bropsy, Bright ""s Disease. Diabetes. 



For Hemorrhoids, Etc. 



It has been used medicinally and prescribed by 

 physicians for nearly one hundred years. 



DIEECTIONS:— Take one or two glasses about a, 

 half-hour before each meal. 



Case One Dozen Half-Gallon Bottles, $4.50. 



Case Fifty Quarts (Aerated). S7.50. 



Bedford Mineral Springs Co., Bedford, Pa. 



Philadelphia Office. 1004 Walnut St. 



CPD tO cblD home, selling 



LIGHTNING PLATER 



and plating jewelry, watches 



new oa &11 kinds of metal 

 with gold, silver or nickel. 

 No experience. No capitaJ. 



agenl.iSS. Write for circu- 

 lars II. E. DEL.no &. 

 Co Columbus, O. 



HiiSTED's Elements of Geometry. Fifth ed. $1.75. 



Halsted's Elementary Synthetic Geometry. Si. 50. 



Halsted's Mensuration: Metric Geometry. Fourth 

 ed., postpaid, SI. 10. 



Halsted's Lobatschewsky's Non-Euclidean Geom- 

 etry. Fourth ed., postpaid, $1.00. 



Halsted's Boltai''s Science Absolute of Space. 



Halsted's Geometry of Position (Rigorously 

 non-quantitative). To appear shortly. 

 Address George Bruce Halsted, Professor of 



Mathematics, University of Texas, Austin, Texas. 



AGENTS WANTED ON SALARY 



or commission to handle the New Patent Chemical 

 Ink Erasing Pencil. Agents making $50 per week. 

 Monroe Eraser M'f'g Co., X 223. La Crosse, Wis. 



