1903.] MINUTES. 7 
AFTERNOON SEssIon, 2 P.M. | 
Vice-President BARKER in the Chair. 
The following papers were read : 
“The Curtis Steam Turbine,” by Mr. W. L. R. Emmet, of 
Schenectady, N. Y. 
“The Principle of Least Work in Mechanics and Its Possi- 
ble Use in Investigations Regarding the Ether of Space,” by 
Prof. Mansfield Merriman, of Bethlehem, Pa. 
“The Nernst Lamp,” by Mr. Alexander Jay Wurts, of 
* Pittsburg. 
“The Problem of the Trusts,” by Mr. C. Stuart Patterson,, 
of Philadelphia. 
“On the Dependence of what apparently takes place in 
Nature, upon what actually occurs in the Universe of Real 
Existences,” by Prof. G. Johnstone Stoney, F.R.S., of London. 
EVENING Session, 8 P.M. 
At the Hall of the Historical Society of Pennsylvania, S. W. Cor. of 
Locust and Thirteenth Streets. 
President SMITH in the Chair. 
The following papers were read : 
“The President’s Address—A Brief History of the Society,” 
by Prof. Edgar F. Smith. 
“The Carnegie Institution During the First Year of Its 
Development,” by President Daniel C. Gilman, of Baltimore. 
Aprit 8.—Mornine Szssion, 10 A.M. 
Vice-President LANGLEY in the Chair. 
The following papers were read : 
“The Double Star System 2 518,” by Mr. Eric Doolittle, of 
Philadelphia. Introduced by Prof. M. B. Snyder. 
