250 



SCIENCE. 



[Vol. XVII. No. 430 



Another valuable type of reflecting galvanometer is the Deprez- 

 D'Arsonval dead-beat galvanometer (Fig. 5), or, as it is commoQly 

 called, the D'Arsonval galvanometer. 



This type of instrument has won favor with all, on account of 



tection or measurement of electrical quantities. It is one of the 

 finest of the "dead-beat" variety; and the needle, after being de- 

 flected, returns to its zero position immediately, and without the 

 slightest oscillation, while it is so sensitive that it may easily be 



its great delicacy of action, simplicity, and convenience. In a 

 recent article in the London Electrician, Professor W. E. Ayrton 

 gives it as his opinion, that, properly constructed, this type of 

 galvanometer, is the most sensitive instrument known for the de- 



deflected through a considerable arc by simply touching the fingers 

 to the two terminals of the instrument. The induction-currents 

 produced by turning a coil of wire about a diameter so as to cut, 

 the earth's lines of force may also be rendered visible to an entire 



Publications received at Editor 

 April 20-25. 



Brewer, E. C. The Historic Note-Book: -with an 

 Appendix of Battles. Philadelphia, Lippincott. 

 997 p. 8°. 



Connecticut, Thirteenth Annual Report of the 

 State Board of Health of the State of, for the 

 Year ending Nov. 30, 1890. New Haven, State. 

 196 p 8°. 



Emery, F. P. Notes on English Literature. Boston, 

 Ginn. 155 p. 18°. $1.10. 



Fewkes, J. W., ed. A Journal of American Ethnol- 

 ogy and Archeology. Vol. I. Boston and New 

 York, Houghton, Mifflin, & Co. 133 p. 8°. $2. 



Harper, W. R., and Tolman, H. C. Eight Books of 

 Cesar's Gallic War. New York, Cincinnati, and 

 Chicago, American Book Co 602p. 12°. $120. 



Kansas Academy of Science, Transactions of the 

 Twenty-second Meeting of the, 1889. Vol. XII. 

 Part. I. Topeka, Kan. Pub. House. 189 p. 8°. 



Massachusetts State Agricultural Experiment Sta- 

 tion at Amherst, Eighth Annual Report of the 

 Board of Control of the, 1890. Boston, State. 

 324 p. 8°. 



New Zealand Journal of Science, The. Vol. I. No. 

 1. January, 1891. Dunedin, Matthews, Baxter, 

 & Co. 48 p. 8°. 



Packard, A. S. Insects Injurious to Forest and 

 Shade Trees. (U. S. Entom.) Commis., Bull. No. 

 7. Washington, Government. 957 p. 8". 



Powers, E. War and the Weather. Revised ed. 

 Delavan, Wis., The Author. 202 p. 12°. $1. 



RiBOT, Th. The Diseases of Personality. Chicago, 

 Open Court Pub. Co. 157 p. 12°. 75 cents 



Royal S6ciety of Canada Haud-Book. Montreal 

 Meeting, 1891. Montreal, Roy. Soc. Can. 140 p. 

 16°. 



Wright, L. Optical Projection: A Treatise on the 

 Use of the Lantern, etc. London and New York, 

 Longmans, Green, & Co. 426 p. 12°. $2.25. 



Zoological Gardens and Aquaria for Boston: An 

 Appeal. Boston, Best. Soc. Nat. Hist. 47 p. 24". 



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