324 ANNALS NEW YORK ACADEMY OF SCIENCES 



Both papers were illustrated with beautiful lantern slides. 

 The Section then adjourned. 



Alexis A. Julien, 



Secretary. 



SECTION OF BIOLOGY. 

 March 11, 1907. 



By permission of Council no meeting was held. 



M. A. BiGELOW, 



Secretary. 



SECTION OF ASTRONOMY, PHYSICS AND CHEMISTRY. 



March 22, 1907. 



Section met at 8:15 P. M., in conjunction with the Physics Club of New 

 York City, Mr, Robert H. Cornish presiding. 



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

 The following program was then offered: 



Demonstrations. 

 F. J. Arnold, Finding the Weight of an Irregular Body by 



Means of its Center of Gravity. 

 R. H. Cornish, Method of Projection on Screen of Lines of 



Force Surrounding a Conductor Carrying a 

 Current. 

 R. H. Cornish, Mechanical Illustration of Beats in Sound. 



J. Stewart Gibson, New Piece of Apparatus for Showing the Rela- 

 tion between Intensity of Illumination and 

 Distance. 

 W. R. Pyle, (a) Dip Needle Demonstration. 



(b) Magnetizer for INIagnets. 

 E. R. Von Nardroff, An Apparatus for Determining the Moment of 



Inertia in gm-cen^ Units. 

 Charles Forbes, (a) The Osmosescope. 



(6) The Centrifugal Railway. 



