11 



SCIENCE. 



[Vol. XVII. No. 424 



CALENDAE OF SOCIETIES. 



Philosophical Society, Washington. 



March 14. — Swan M. Burnett. A New 



Metric System of Numbering Prisms; J. 



Stanley Brown, Bernard inite: Is it a Mineral 



or a Fungus ? J. Howard Gore, The Geodetic 



Operations in Russia; E. D. Preston, The 



Study of the Earth's Figure by Means of the 



Pendulum. 



Women's Anthropological Society of 



America, Washington. 

 March 14. — Mrs. Christine Ladd Franklin, 

 Intuition and Reason. 



Boston Society of Natural History. 

 March 18. — G. Baur, The Importance of a 

 Scientific Investigation of the Galapagos 

 Islands; W. O. Crosby, On the Colors of 

 Soils. 

 Royal Meteorological Society, London. 

 Feb. 18.— C. Harding, The Great Frost of 

 1890-91; H. F. Blanford, On the Variations 

 of the Rainfall at Cherra Eoonjee in the 

 Khan Hills, Assam; T. W. Blackhouse, The 

 Problem of Probable Error as applied to 

 Meteorology. 

 American Institute of Electrical Engi- 

 neers. 

 March 17. — J. J. Carty, Inductive Dis- 

 turbances in Telephone Circuits. 



Wants. 



A tiy person seeking a position /or "which he is quali- 

 /iedby his scientijic aitaijtmen's, or any person seeking 

 some one to Jiii a position of this character^ be it thai 

 of a. teacher of science^ chemist^ dra7ights7nan, or luhai 

 not, may have the ' IVant^ inserted under this head 

 FREE OF COST, if he Satisfies the pubiisher of the suit- 

 able character of his application. A ny person seeking 

 information on any scientific question, the address of 

 any scientific man, or who can in any may use thiscol- 

 umn for a purpose consonant with the nature of the 

 paper, is cordially invited to do so. 



A COLLEGE GEADUATE— has had four years' 

 experience in analytical laboratory and in 

 works— desires position 'in chemical works, oil re- 

 finery, or paint works, or in any position where 

 a technical chemist is needed. Address " CHEM- 

 IST," care Science. 



A HARVARD M.A., especially interested in Nat- 

 ural History, would like to learn of some out- 

 door occupation for the summer. Remuneration a 

 secondary object. SUMMER, Science Office. 



rj'OR SALE.— 



AN DER SEE. Eeisebriefe aus dem Moore 

 und von der Nordsee. Von Dr. Ernst 

 Doges. (1884.) 178 p. 13°. 25c. 



DIE KOLONIALREICHE UND KO- 

 LONISATIONSOBJEKTE DER GE- 

 GENWART. Kolonialpolitische und 

 kolonialgeographisehe Skizzen von Dr. 

 Emil Deckert. Leipzig, 1885. 340 p. 12". 

 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". 25c. 



IE BEZIEHUNGEN ZWISCHEN 

 GEISTESSTORUNG UND VER- 

 BRECHEN. Nach Beobachtungen in der 

 Irrenanstalt Dalldorf von Dr. W. Sander 

 und Dr. A. Eichter. 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. 2 

 Heft. Heidelberg, 1884. 151 p. 8°. 2oc. 



KRITISCHE UND EXPERIMEN- 

 TELLE BEITRAGE ZUR LEHRE 

 VON DER FUTTERUNGSTUBER- 

 CULOSE. Von Dr. F. Wesener. Frei- 

 burg, 1885. 98 p. 8°. 35c. 



ZUR KUNSTLICHEN ERNAHRUNG 

 DER SAUGLINGE IN DEN DREI 

 ERSTEN LEBENSMONATEN. Es- 

 perimentell plinisehe Untersuchung von 

 Dr. H. Schoppe. Tubingen, 1884. 82 p. 

 8°. 25c. 



GEDENKTAGE DER PSYCHIATRIE 

 ALLER LANDER. Von Dr. Heinrich 

 Laehr. Berlin, 1885. 65 p. 8°. 50c. 



SCIENCE BOOK AGENCY 



47 l>afayette Place, TXew THork, 



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

 Department of one of our best colleges, would 

 like to negotiate for some industrial position, where 

 his knowledge would be of avail. Can furnish best 

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



12 



iEMULSION 



WANTED— A position to teach Electrical Engi- 

 neeriDg by a student from leading Englisli and 

 French and U. S. science schools, or would accept 

 position as Consulting Electrical Engineer, Electri- 

 cian, etc. Very highest testimonials London & 

 Hartford Publishing Co., N. Y. vintemational Press 

 Department.) 



WANTED.— A young man in college would like a 

 position during the summer of 1891 in some 

 scientific work, particularly Orinthology, either as 

 an instructor or tutor, or in making collections or 

 accompanying some scientific expedition. Can give 

 good references. Address HUBERT L. CLARK, 

 Amherst, Mass. 



WANTED.— A young man who has been teaching 

 in a first-class mgh School desires a position 

 in a similar institution. Is competent to teach 

 Mathematics, Latin, Book-keeping, and the English 

 branches. Can give highest references Address H. 

 W. MARTHENS, 6208 Broad St., Pittsburgh, Pa. 



WANTED.— A situation in a scientific house by a 

 graduate of the scientific department of the 

 Jersey City High School as Geologist. Mineralogist 

 or as assistant teacher in Physics or assistant to a 

 chemist. Best of references. E. "W. PERRY, 582 

 Third Street, Jersey City, N. J. 



WANTED.— By a medical student of three 

 courses, a position on some war or mercan- 

 tile vessel sailing between America and some for- 

 eign country, as Clerk, Assistant Physician or Drug- 

 gist, or any respectable occupation. Content with 

 a moderate remuneration. Highest commenda- 

 tions. "W. L. S., Science Office. 



TNFORMATION WANTED.— Clarence W. Bowen, 

 1 Secretary of the Committee on the Centennial 

 of Washington's Inauguration, 251 Broadway, New 

 York, desires information regarding the portraits of 

 John Hathorn and Jeremiah Van Rensselaer, mem- 

 bers of Congress from New York. These portraits, 

 for the Memorial Volume, are particularly desired, 

 to complete the list of portraits of the New York 

 delegation in Congress at the time of Washington' 

 inauguration. 



DOES CURE 



CONSUMPTION 



In Its First Stages. 



Sesure you get the genuine. 



Exchanges. 



[Freeof charge to all, if of satisfactory character. 

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

 York.l 



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-ggQ, shunts, lampand |scale, for a Weston voltmeter 

 and ammeter, or arge Wheatstone bridge, dial pattern, 

 or a portable testing outfit. Address G. A., Science 

 Oi?ice, 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 — AH 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., Toionto, Can 



V would like to exchange first six vols. Roscoe anc 

 Schorleminer's Chemistry, and Vols. II. and III. of " Ed 

 ucation" for American Naturalist for i88g and i8go, or 



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

 Ripon, Wis. 



I have a good supply of Eastern Coleoptera which I 

 wish to exchange for species not in my collection. Mel- 

 andryidae and Oedemeridae especially desired. Joe C. 

 Thompson, Rosebank P, O., Box 73, S. I. 



I wish to exchange Eastern Lepidoptera for those that 

 I do not have, particularly those found in the South. 

 Jos. F. Crandall, Honesdale. Wayne Co., Pa, 



To exchange, i8go Seeger and Guernsey Cyclopedia, 

 containing a complete list of the manufactures and pro- 

 ducts of the U. S., and address of first hands, cost $6. 

 David R. Lewis, Saybrook, III. 



Protection from LigMning 



SMEE THE ROD AND SPOIL TEE HOUSE ! 



To dissipate the energy of a lightning dis- 

 charge, — to prevent its doing harm, — it is 

 necessary that something should be placed in 

 its path upon which its energy (capacity for 

 causing damage) may be espended. The 

 Patent Lightning Dissipater is specially de- 

 signed to serve this purpose, and will be 

 sent prepaid, with full directions for its ap- 

 plication, to any part of the United States, not 

 previously taken by agents, on receipt of $7. 00. 



AGENTS WANTED. 



N. D. C. HODGES, 



47 Lafayette Place, 



IVEW YORK. 



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This binder is strong, durable and 

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