MINUTES. 39 



Francis P. Venable, Ph.D., LL.D., Chapel Hill, N. C; 



J. Edward Whitfield, Philadelphia ; 



Bailey Willis, E.M., C.E., Washington. 



Foreign Residents : 



Yves Delage, Paris ; 



Otto Nordenskjold, Stockholm ; 



William Matthew Flinders-Petrie, D.C.L., LL.D., F.R.S., 

 London ; 



Edward Sievers, Leipzig ; 



Sir William Turner Thiselton-Dyer, LL.D., Ph.D., F.R.S., 

 Kew, England. 



The following papers were read : 



" On the Theory of the Double Suspension Pendulum," by 

 Prof. Robert S. Woodward, of New York. 



"The Relation between the Economic Depth of a Bridge 

 Truss and the Depth Which Gives Greatest Stiffness," by Prof. 

 Mansfield Merriman, of South Bethlehem, Pa. 



" On tne Dispersion, Absorption, Fluorescence and Mag- 

 netic Rotation of Sodium Vapor," by Prof. Robert Williams 

 Wood, of Baltimore. 



" On a Possible Case of Scattering of the Ultra- Violet 

 Light by Gas Molecules," by Prof. Robert Williams Wood, of 

 Baltimore. 



" The Use of the Falling Plate Oscillograph as a Phase 

 Meter," Dr. William McClellan, of Philadelphia. 



" On the Brains of Scymnus, Mitsukurina and Chlamydo- 

 selachus, with Remarks Upon Selachian Brains from Stand- 

 points Morphic, Ontogenic, Taxonomic, Phylogenic and Peda- 

 gogic," by Prof. Burt G. Wilder, of Ithaca. 



