298 Scientific Intelligence. 



Secretary : F. W. Putnam. General Secretary : C. L. Mees, of 

 Terre Haute, Ind. 



The next meeting of the Association will be held in Toronto, 

 on the last Wednesday in August. 



The retiring president, Prof. S. P. Langley, delivered an ad- 

 dress on a History of a Scientific Doctrine ; Major Powell, the 

 President of the meeting, on Competition as a factor in Human 

 Progress ; C. E. Monroe, Vice-President of the Chemical Section, 

 on Some Phases in the progress of Chemical Science ; Prof. G-. H. 

 Cook, Vice-President of the Geological Section, on The Inter- 

 national Geological Congress and our part in it as American ge- 

 ologists ; Prof. C. C. Abbott, of the Section on Anthropology, on 

 the Evidences of the Antiquity of Man in Eastern North America ; 

 Prof. OpwMond Stone, of the Section of Mathematics and Astron- 

 omy, on the Motions of the Solar System; Prof. A. A. Michelson, 

 of the Physical Section, " A Plea lor Light Waves." 



The following is a list of the papers accepted for reading: — 



Section A. — Mathematics. 



E. W. Hyde : The directional theory of Screws. — Considerations on the funda- 

 mental idea of quaternions. 



H. M. Parkhurst: Obliteration from illumination in stellar photometry. 



E. D. Preston : Deflections of the plumb line, and variations of gravity in the 

 Hawaiian Islands. 



R. S. "Woodward : Laws of frequency of errors of interpolated logarithms. 



J. W. Hough : On a new method of construction of equatorial domes. 



James McMahont : K method of representing the imaginary elements of a geo- 

 metric figure and of using them in construction. 



S. C. Chandler : On a new catalogue of variable stars. 



H. M. Paul : A new short period variable in Antlia. 



William Harkness: On the value of the solar parallax deduced from the 

 American photographs of the last transit of Venus. 



G-. C. Comstock : A desideratum in the American Ephemeris. 



D P. Todd: Fusiyama, Japan, as a site for a mountain observatory. 



Asaph Hall : On the supposed canals on the surface of the planet Mars. 



William Hoover: Preliminary elements of the orbit of comet 1886, IX. 



C. A. Waldo : Note on the mathematics of the seismo scope. 



H. B. Newson : On some old and new theorems in Solid G-eometry. 



Lewis Boss : Orbit of Brooks's comet — 1888, C. 



Irving Stringham : On the measure of inclination of two planes in space of 

 four dimensions. 



F. Boas : On census maps. 



Section B. — Physics. 



W. LeConte Stevens : On the quality of musical sounds. 



W. A. Rogers: On the radiation of heat between metals by induction and con- 

 duction, with numerical results for steel and brass. — On the terms mass and 

 weight. 



E. P. Howland : On the best methods of making instantaneous photographs. 

 — Description of a new and improved dissolver for the lantern. 



C. A. Oliver : Note upon retinal photography. 



R. S. Woodward : On the emissivity of a metallic bar cooling or heating in air. 



T. C. Mende shall: On dynamical units. — Effect of added term of the equation 

 of the quadrant electrometer on its deflection curves. 



C. J. H. "Woodbury : Protection of watches against magnetism. 



