3$ Thk Period from 1901 to 1910 



Geology and Geography. J. F. Kemp: "Pr.e-Cambrian Sediments in the 



Adirondack's." 



Botany. William Trelease : '"Some Twentieth Century Problems." 



Statistical Data 



Xll. THE PERIOD FROM 190 1 TO igio 



In 1900 the weekly journal Science became the official organ of the Asso- 

 ciation. Thereafter the principal addresses at the meetings were published 

 in Science, and since 1907 the Proceedings are simply summaries without 

 any details of addresses or papers. Partly as a consequence of this arrange- 

 ment and partly because of a rapid increase in the number of scientists in 

 America, the membership of the Association increased several fold during 

 the first decade of this century. The programs of the Association became 

 correspondingly larger and more important, the growth of the Section on 

 Chemistry having been extraordinary. It is impossible within the space 

 available in this volume to do more than to give the titles of the addresses 

 of the presidents and the vice presidents. 



Special summer meetings were held at Ithaca, X. Y.. June-July. 1906. at 

 which 66 papers were presented, and at Hanover, X. H.. June-July, 1908, 

 at which 25 papers were presented. 



Presidential Addresses 



R. S. Woodward (mathematics), retiring president at the meeting held 

 at Denver, Colorado, in August, 1901, delivered an address on "The Prog- 

 ress of Science." (Vol. 50, pp. 219-235.) 



Charles Sedgwick Minot (medicine), retiring president at the meeting 

 held at Pittsburg, Pa., in June-July, 1902, delivered an address on "The 

 Problem of Consciousness in Its Biological Aspects." ( Vol. 51, pp. 265- 

 -'83.) 



Asaph Hall I astronomy ), retiring president at the meeting held at Wash- 



