110 RECORDS 



rate of interruption of the coil so as to produce a stroboscopic 

 effect, and thus the movements of the tongue of air in the mouth 

 of the pipe and the vibrations and air currents in the pipe could 

 be readily followed. 



The same method was also applied by the author to study 

 the behavior of unignited jets of illuminating gas when acted on 

 by sound waves. 



The paper was illustrated by a number of photographs of the 

 phenomena observed. 



W. S. Day, 

 Secretary. 



SECTION OF BIOLOGY. 



March i i, 1901. 



Section met at 8:15 P. M., Professor C. L. Bristol pre- 

 siding. 



The minutes of the last meeting of Section were read and 

 approved. 



The following program was then offered : 



H. F. Osborn, Systematic Revision of the American Eocene 

 Primates and of the Rodent Family Myxodectid.^. 



0. P. Hay, The Composition of the Shells of Turtles. 



M. A. Bigelow, Some Comparisons of the Germ-Layers in 

 Entomostraca Crustacea. 



Prior to the reading of papers, a communication from the 

 Secretary of the Academy was read, stating that a grant of ;^ 100 

 from the John Strong Newberry Fund had been authorized by 

 the Scientific Alliance, and as the subjects in which an award 

 might be made this year were Geology and Palaeontology, he 

 would be pleased to receive a nomination from the Section of 

 Biology. On motion of Professor Osborn the matter was 

 referred to a committee consisting of the Chairman and two 

 additional members. The Chair nominated Professor Osborn 

 and the Secretary of the Section. 



Professor Charles L. Bristol and Dr. Henry E. Crampton 

 were re-elected Chairman and Secretary respectively. 



