RECORDS. 665 



papers based upon observations made during the previous sum- 

 mer. In this connection he alluded to the activity of members 

 of the Academy in many widely different fields of research, and 

 to the death of Mr. Nathan R. Harrington, whose plans for an 

 expedition up the Nile had been presented at one of the last 

 meetings of the Academy. Allusion was also made to the loss 

 the Academy had sustained in the death of Judge Charles P. Daly. 

 Two members of the Academy had been recently elected to im- 

 portant offices in the American Association for the Advancement 

 of Science, and it is incumbeh-t upon the Academy to prepare for 

 the meeting of the Association in New York City during the 

 month of June, 1900. 



A committee consisting of Professors Kemp, Britton and 

 Stevenson was appointed to draw up suitable resolutions con- 

 cerning Judge Charles P. Daly. 



Richard E. Dodge, 

 Recording Secretary. 



SECTION OF ASTRONOMY AND PHYSICS. 



October 2, 1899. 



Section met at 8.40 P. M., Professor M. I. Pupin, presiding. 

 The minutes of the last meeting of the Section were read and 

 approved. 



The following program was offered : 



William Hallock, Compound Harmonic Vibrations of a 

 String. 



Summary of Paper. 



Professor Hallock. Some German investigators have ex- 

 perimentally determined by photography the motion of a point 

 of a string. The vibration varies of course according to the 

 part of the string bowed, the speed, the kind of bow, etc. 



This communication consisted essentially of a set of curves 

 showing successive positions of a string vibrating under the influ- 

 ence of a fundamental, and the first seven overtones, each curve 

 Annals N. Y. Acad. Sci., XII, June i, 1900 — 42. 



