or three points instead of on a flal surface, which usually binds the oul 

 of the metal plete. The diaphragm nave to one note a clear resonance, 

 in which the overtones so characteristic of metal plates in vibration were 

 distinctly heard (middle A of piano). On sounding this note into the 

 mouthpiece, while keeping the other telephones covered so as not to be 

 directly affected by the air-waves, it was found thai the overtones were 

 audibly traceable in one of the other telephones with which connection 

 was had over a line of about one-third of a mile with a ground return cir- 

 cuit. 



1 1 is difficult enough to understand how the minute waves into which a 

 metal plate is thrown by a vigorous note of the voice can reproduce sound 

 through the intermediate agency of maxima and mimima of resistance in 

 the medium of current transmission; but that the minute wavelets which 

 are produced upon the backs of these, should at, the extremity of a long 

 line produce sufficiently powerful variations of conductivity to cause the 

 mechanical fluttering of the diaphragm of another instrument to a suffi- 

 cient, degree to cause the effeel of sound could scarcely have been foreseen. 



Pending nominations 864, 867, 868, 869, 870, and new 

 nomination 871 were read. 



[n the absence of Prof. Houston the consideration of his 

 motion to amend the minutes was postponed to the next 

 regular meeting. 



The Secetary read a letter from Prof. Henry Morton, dated 

 Hoboken, Oct. 7., drawing attention to a marked word, 

 " Foucou's" in tin enclosed original letter, written to him by 

 Prof. Sadtler, dated Dec. 31, 1877; and for the purpose of 

 showing that he (Prof. Morton) did Prof. Sadtler no injus- 

 tice in quoting this word (instead of Fouque) in his letter of 

 May 15, 1878, commented upon in Prof. Sadtler's reply as 

 published in the Proceedings A. P. S., Vol. XVII, page 724. 



The pending nominations 864, 867 to 870 were balloted 

 for, and, after scrutiny of the ballot boxes by the presiding 

 officer, the following were declared duly elected members of 

 the Society : — 



Dr. Alberl II. Smith, of Philadelphia. 



Rev. Saml. Longfellow, of G-ermantown. 



Rev. Ed. A. Foggo, D. D., of Philadelphia. 



M. A. I >escloizeaux, of Paris. 



Dr. (A Schorlemmer, of Manchester, England, 

 and the meeting was adjourned. 



