666 RECORDS. 



showing the position of the string at a particular instant. Sixteen 

 such curves were shown for the first sixteen sixty-fourths of a 

 complete period of the fundamental. The amplitude of the com- 

 ponent was proportional to the wave-lengths, in each case. 

 Thirty-two points were computed for each curve. 

 Each curve is computed from the formula 



y^ = a sin 27l^ sm 2~ — — \- o sni 27r -^ sm 2;r y- -f etc. 



-|- // sin 2~ ,_- sm 2z -j- 

 a = 2b = ^c = 4.d =z c^e = 6f=:yg = Sk 



t; = 27; = 37; = 47; = 57;, = 67;, = 77^ = 87;. 



In the discussion, Professor Pupin said that it would be interest- 

 ing to photograph the vibration of a string loaded, and then un- 

 loaded. Such a study might help our theories of electrical 

 waves along a cable. 



Wm. S. Day, 



Secretary. 



SECTION OF BIOLOGY. 

 October 9, 1899. 



Section met at 8:15 P. M., Professor Frederic S. Lee, presid- 

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

 approved. The names of 4 candidates for resident membership 

 were read and referred to the Council according to the By-Laws. 



The evening was devoted to reports of the past summer's 

 work by a number of members. 



Summary of Papers. 



Professor H. F. Osborn gave an account of the Exploration 

 BY THE American Museum Party in the Co.aio Beds of South- 

 ern Wyoming, and of further work in the Bone Cabin Ouarrs^, 

 which resulted in the discoverv of a laro;e number of the remains 



