TITLES OF PAPERS. 407 



When the cooling is symmetrical, m is c\2, and when the sides of the sheet are 

 kept at a fixed temperature, w is also c\2. These are the cases above considered 

 and illustrated by figure 1. 



The problem is akin to that of the cooling of the earth and may be made to de- 

 pend upon the solution of that. For distinction sake we let the temperature of a 

 point in a sheet cooling under the conditions given above as applicable to figure 

 (1) be Vm, the point being at a distance x from the margin such thata/cis m, 

 where c is the thickness of the sheet, and if we let the temperature of a cooling 

 globe of radius c cooling under similar conditions,* at a distance from the center of r 

 such that r/c is m, be u m , it may be shown that V m = m u m -f (1 — m) u 1 — m . 



Discussion of this paper was omitted in order to allow time for the ex- 

 hibition of some material from the trap sheets of the Connecticut valley 

 by the chairman, B. K. Emerson. 



The Petrographic Section then adjourned. 



After the retiring of the Petrographic Section (referred to on page 

 393), Vice-President Orton resigned the chair to President Le Conte and 

 the proceedings in general session were continued. 



The first paper was read as follows : 



MECHANICS OF GLACIERS, MORAINES, AND STRATIFICATION 

 BY HARRY FIELDING REID 



Remarks were made by the President. A brief abstract is published 

 in Science, volume 5, January 15, 1897, page 91. 



The next paper was by the same author : 



VARIATIONS OF GLACIERS 

 BY HARRY FIELDING REID 



An abstract is published in Science, volume 5, January 15, 1897, 

 page 91. 



*As investigated by Woodward in Annals of Mathematics, vol. iii, 1887, p. 77, equation 10. 

 L/X— Bull. Geol. Soc. Am., Vol. 8, 1896 



