56 



SCIENCE. 



[Vol. XVII. No. 416 



CALENDAR OF SOCIETIES. 



Philosophical Society, Washington. 



Jan. 17.— C. V. Riley, Bacteriology in 



Applied Entomology ; H. A. Hazen, The 



Lawrence, Mass. , Tornado of July 26, 1890; 



Asaph Hall, Note on (Q Cancri. 



Women's Anthropological Society of 

 America, Washington. 



Nov. 8, 1890.— Mrs. Anita Newcomb 

 McGee, The Papers presented before the 

 Anthropological Section of the American 

 Association for the Advancement of Science. 



Nov. 23, 1890. -Clara Bliss Hinds, The 

 Influence of Systematic Exercise upon 

 Women. 



Dec. 6, 1890.— Miss Cleveland Abbe, Psy- 

 chology in its Physiological Analysis ; Mrs. 

 Thomas Wilson, The Beguinage of Ghent. 



Jan. 3, 1891.— Miss Alice C. Fletcher, A 

 Study of the Negro Race. 



Jan. 17. — Miss Clara Rogers, The English 

 Cottage System. 



Boston Society of Natural History. 



Jan. 21.— A. E. Dolbear, The Physics of 

 Crystalline and Cellular Structure. 



LOW-PRICED BOOKS. 



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EliECXKICITY. 



Alternate Current Machinery. By G. Kapp. 



i8°. 



_\IISTRY of the Secondary Batteries of Flante 



and Faure. By J. H. Gladstone and A. Tribe. 



Dyn.miic Electricity. By John Hoplcinson, J. A. 

 Schoolbred, and R. E. Day. 18° 



Dynamo-Electric Machines, Recent Progress in. 

 By Professor Sylvanus P. Thompson. 18° ... . 



Electric Bells. By F. C. Allsop. 12° 



F.LECTRic Lighting from Central Stations. By G. 



Electricity, Supply of, by Local Authorities. 



By K. Hedges. 8° 



Electro-Magnetic Telegraph, A Hand-Book of 



the. By A. E. Loring. 18° 



Electro-Magnets. By Th. Du Moncel. Tr. by 



C. J. Wharton 



Electro-Telegraphy. By F. S. Beecher. 16**. . 

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Description of the Edison System. By L. H. 



Latimer, C. J. Field, and J. W. Howell. 18°.. 

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18° 



Practical Dynamo-Building for Amateurs. By 

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Terrestrial Magnetism and the Magnetism of 

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SANIXAKX SCIENCE. 



Air We Breathe, the, and Ventilation. By Pro- 

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Bad Drains, and How to Test them. By R. H. 



DiKTY Dustbins and Sloppy Streets. By A. P. 

 Boulnois. r2° 



Disease and Putrescent Air. By T. Rowan. 8°.. 



Drainage of Towns. By J. Phillips. 8° 



DwELLiNG-HouSES: Their Sanitary Construction 

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Fashion in Deformity. By William Henry Flower. 



Food. The Composition. Digestibility, and Nu- 

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Health, The Laws of. By W. H. Corfield. 8°.. 

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Foundations for Houses. By Glenn 



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Wants. 



A ?ty peyso7i seeking a position for luhick he is quali- 

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A UNIVERSITY GRADUATE IN SCIENCE, at 

 present a junior student in medicine at the Uni- 

 versity of Michigan, desires a position as teacher or 

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WANTED.— A young man wishes a position as in- 

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WANTED. — There being a considerable annual 

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WANTED.— A situation as Analytical Chemist is 

 desired by the assistant of the late noted 

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 nished. Address Prof. EDWIN H. BOGARDUS, 

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COULD some one inform me what the ingredients 

 and origin of asphalt as used for street-paving 

 and gathered at Trinidad are? Also how gathered 

 and shipped by natives, and mode of refining by the 

 Warren-Scharf Co. of New York and the Barber Co. 

 of Washington? G. KNIPEK, 28 Gunn Block, Grand 

 Rapids, Mich. 



Exchanges. 



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

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1 would like to exchange first six vols. Roscoe and 

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 works 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- 

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I wish to exchange Eastern Lepidoptera for those that 

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To exchange, 1890 Seeger and Guernsey Cyclopedia, 

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 David R. Lewis, Saybrook, III. 



For exchange— Nice specimens of Unios alatus, trigo- 

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 plicatus cornutus. Margaritana confrogosa, complanata, 

 rugosa. Anadonta edentula, decora, corpulenta, and 

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