296 PROCEEDINGS: PHILOSOPHICAL AND HISTORICAL SOCIETIES 



the overlying Fort Union; (4) the line at the base of the Lance formation 

 becomes more clearly than ever the logical point at which to draw the 

 line between Cretaceous and Tertiary; (5) finally, the Lance formation 

 seems to find a final resting place in the Tertiary. 



Edson S. Basttn, 

 Robert Anderson, 



Secretaries. 



THE PHILOSOPHICAL SOCIETY OF WASHINGTON 



At the 697th meeting, held at the Cosmos Club on October 14, 1911, 

 the following papers were read: Direct and indirect determination of the 

 wilting coefficient of soils for different plants: L. J. Briggs andH. L. Shantz. 

 (See this Journal 1: 228. 1911.) Magnetic rotation and ellipticity for 

 massive mirrors: P. D. Foote. (See this Journal 1 : 145. 1911.) 



The 698th meeting, held on October 28, 1911, at the Cosmos Club, 

 was a joint meeting with the Washington Academy of Sciences. Profes- 

 sor Arthur Schuster, by invitation, presented a most interesting and 

 instructive paper on The foundations of physics. 



At the 699th meeting, November 11, 1911, at the Cosmos Club, the 

 following papers were presented, A. J. Lotka: Evolution in discontinuous 

 systems; P. G. Nutting: Helium tubes as light standards. (See this 

 Journal 1: 221. 1911.) R. L. Faris, Secretary. 



THE COLUMBIA HISTORICAL SOCIETY 



At the 125th meeting, November 21, 191 1, Mrs. Corra Bacon-Foster 

 presented a paper on the Early Development of the Potomac Route to 

 the West. 



Mary Stevens Beall, Secretary. 



CORRECTIONS, VOL. 1 



55, Fig. 1, for "1537° C." read "1357° C." 

 213, lines 3 and 9, for " (c)" read " (e)." 



213, line 15 from bottom, for "one" read "the." 



214, line 15, after "force" insert "for unit current in each circle." 



216, line 7, before "current," for "the" read "this." 



217, line 16, after "called," for "the" read "this." 



217, table, for "22° C." read "20° C." 



218, line 3, for "AT" read "M." 



