SCIENCE. 



[Vol. XVII. No. 432 



CALENDAR OF SOCIETIES. 



New York Academy of Sciences. 



May 18.— Charles F. Cox, What is a Dia- 

 tom (illustrated by lantern views). 



Appalachian Mountain Club, Boston. 



May 13. — Henry G. Spaulding, Landscape 

 in Litei:ature, Nature, and Art (Illustrated). 



Manuscripts prepared for printers; 



Proof-reading, revising, and all work prepara- 

 tory to publishing, done; 



Sliortband dictations accurately taken; 



Type-writing correctly, neatly, and tastefully 

 executed,— by one specially trained in the work, 

 and who has had a long practical experience in 

 all kinds of book-work. 



Scieutitic Worfe: a Specialty. Correspondence 

 solicited. 



Reference: Editor of Science. 



H. A. ANDREWS, care "Science," 



47 Lafayette Place, New York. 



PENSIONS 



THE DISABILITY BILL IS A LAW. 



Soldiers D'sabled Since the War are Entitled. 



Dependent widows and parents now dependent 

 "Whose sons died from effects of army service are in- 

 cluded. If you wish your claim speedily and sue- 



"'^'^'''Znr''''' JAMES TANNER, 



Late Commissioner of Pensions, "Washington, D.C. 



■ppOE SALB.- 



AN DER SEE. Reisebriefe aus dem Moore 

 und von der Nordsee. Von Dr. Ernst 

 Doges. (1884.) 178 p. 12". 25c. 



DIE KOLONIALREICHE UND KO- 

 LONISATIONSOBJEKTE DER GE- 

 GENWART. Kolonialpolitische und 

 kolonialgeographische Skizzen von Dr. 

 Emil Deckert. Leipzig, 1885. 240 p. 13". 

 25c. 



REISEERINNERUNGEN AUS AL- 

 GERIEN UND TUNIS. Von Dr. W. 

 Kobelt. Frankfurt am Main, 1885. Illus- 

 trated. 480 p. 8". 75c. 



TRANSMISSION ELECTRIQUE DU 

 TRAVAIL MECANIQUE. Determina- 

 tion des Elements de la Transmission. Par 

 A. Hillairet. Paris, 1884. Illustrated. 

 79 p. 8°. 35c. 



DIE BEZIEHUNGEN ZWISCHEN 

 GEISTESSTORUNG UND VER- 

 B R E C H E N . Nach Beobachtungen in der 

 Irrenanstalt Dalldorf von Dr. W. Sander 

 und Dr. A. Richter. Berlin, 1886. 404 p. 

 8°. 75c 



BLATTER FUR GEFANGNISS- 

 KUNDE. Organ des Vereins der deuts- 

 chen Strafanstaltsbeamten. Eedigirt von 

 Gustav Ekert. Neunzehnter Band, 1 u. 3 

 Heft. Heidelberg, 1884. 151 p. 8°. 35e. 



KRITISCHE UND EXPERIMEN- 

 TELLE BEITRAGE ZUR LEHRE 

 VON DER FUTTERUNGSTUBER- 

 CULOSE. Von Dr. F. Wesener. Frei- 

 burg, 1885. 98 p. 8". 25c. 



GEDENKTAGE DER PSYCHIATRIE 

 ALLER LANDER. Von Dr. Heinrich 

 Laehr. Berlin, 1885. 65 p. 8°. 50c. 



SCIENCE BOOK AGENCY 



47 I>afayette Place, New York. 



Wants. 



A 7iy person seeking a position /or "which he is qiiali- 

 fied by his scientific attainme^its^ or any perso7i seeking 

 soine 07ie to fill a position of this character^ be it that 

 of a teacher of science^ ckentisty draughts7na?i^ or what 

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A GRADUATE of Tale College, now a medical 

 student, who has made a specialty of the 

 sciences, wishes employment duriufj the summer va- 

 cation, from June 15th, to Oct. Jst, GEO. N. LAW- 

 SON, 22 College St., New Haven, Conn. 



WANTED.— A permanent position that will pay 

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WANTED.— Vols. I and II. of Allen's "Commercial 

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THERE is an opening in this office for a college 

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WANTED— A situation in an Analytical Labi 

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WANTED— A position in some College, Normal 

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 Address "BIOLOGIST,^' care Science. 



WANTED.— All of Vol. I. of Journal of Analytica 

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WANTED— A position in a Summer School of 

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A CHEMIST, taking P. G. work in the Scientific 

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 of references. R. S. W., Bos 691, Amherst, Mass. 



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 Department.) 



Exchanges. 



[Freeof charge to all, if of satisfactory character. 

 Address N. D. C. Hodges, 47 Lafayette Place, New 

 York.l 



For sale, or exchange for geological works, the follow- 

 ing works in anatomy, all latest editions: Allan, Tuain, 

 Gray, Leidy, Masseyi and Rollestin's Forms of Animal 

 Life. S. W. Williston, Lawrence, Kan, 



Will exchange a new Thomson reflecting astatic gal- 

 vanometer, about 6,000 ohms, made by Clark, Muir- 

 head & Co , London, and costing £30, with i-g, i-gg, 

 i-ggg, shunts, lampand Jscale, for a Weston voltmeter 

 and ammeter, or arge Wheatstone bridge, dial pattern, 

 or a portable testing outfit. Address G. A., Scie^ice 

 Office, 47 Lafayette Place, New York. 



For exchange — Fossil leaves from the Laramie beds of 

 South Table Mountain, near Golden, Col., for other fos- 

 sils, historical relics, or minerals. Address John B. Gar- 

 vin, State School of Mines, Golden, Col. 



For Sale or Exchange — All forms and species of Cana- 

 dian birds, mammals, insects, reptiles, fish or other nat- 

 ural history specimens. First class specimens only sup- 

 plied. G. E. Atkinson, 639 Spadina Ave.. Toronto, Can. 



1 would like to exchange first six vols. Roscoe and 

 Schorleminer's Chemistry, and Vols. II. Pnd III. of** Ed- 

 ucation " for American Naturalist for 1889 and i8go, or 

 works on Zoology. C. Dwight Marsh, Ripon College, 

 Ripon, Wis. 



Soda 



Is endorsed and prescribed by leading I 

 I physicians because both the Cod lAmir Oil I 

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) Ask for Scott's Emulsion and take no other. 



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JUST PUBLISHED. 368 PAGES. 

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GEO. P. ROWELL <& CO.. Publisfaera, 



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Ward'sNatural Science Establishment 



mineral§, 



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