Book digitized by Google from the library of the New York Public Library and uploaded to the Internet Archive by user tpb. Various paging List of the author's more important papers on physics and kindred subjects: p. 1-2 Contains also: On the focal length of microscope objectives, by C.R. Cross.--Foci of lenses placed obliquely, by E.C. Pickering and C.H. Williams.--Light transmitted by one or more plates of glass, by W.W. Jacques.--Intensity of twilight, by C.H. Williams.--Light of the sky, by W.O. Crosby.--Light absorbed by the atmosphere of the sun, by E.C. Pickering and D.P. Strange.--Tests of a magneto-electric machine, by E.C. Pickering and D.P. Strange.--Answer to M. Jamin's objection to Ampère's theory, by W.W. Jacques.--An experimental proof of the law of inverse squares for sound, by W.W. Jacques.--Diffraction of sound, by W.W. Jacques.--On the effect of temperature on the viscosity of air, by S.W. Holman