SCIENCE 



A WEEKLY JOURNAL DEVOTED TO THE ADVANCEMENT OF SCIENCE, PUBLISHING THE 



OFFICIAL NOTICES AND PROCEEDINGS OF THE AMERICAN ASSOCIATION 



FOR THE ADVANCEMENT OF SCIENCE. 



Editorial Committee : S. Newcomb, Mathematics ; R. S. Woodwaed, Mechanics ; E. C. Pickering, 

 Astronomy ; T. C. Mendenhall, Physics ; R. H. Thurston, Engineering ; Ira Remsen, Chemistry ; 

 Charles D. Walcott, Geology ; W. M. Davis, Physiography ; Henry F. Osboen, Paleon- 

 tology ; W. K. Brooks, C. Hart Merriam, Zoology ; S. H. Scudder, Entomology ; C. E. 

 Bessey, N. L. Beitton, Botany ; C. S. Minot, Embryology, Histology ; H. P. Bow- 

 ditch, Physiology ; J. S. Billings, Hygiene ; William H. Welch, Pathol- 

 ogy ; J. McKeen Cattell, Psychology ; J. W. Powell, Anthropology. 



Friday, August 30, 1901. 



CONTENTS : 



The Progress of Science : Professor R. S. Wood- 

 ward 305 



Zoology of the Twentieth Century : Professor 

 Chas. B. Davenport '. 315 



Scientific Books : — 



Dubois's Legons de physiologic experimentale : 

 G. N. I. S. Herrick on the Home Life of the 

 Wild Birds: A. K. F 324 



Discussio7i and Correspondence : — 



The Coast Prairie of Texas: Dr. Robert T. 

 Hill. Discord and Beats : Professor Max 

 Meyer. The International Catalogue of Scien- 

 tific Literature : TALCOTT WiLLIABIS 326 



Shorter Articles : — 



Notes on the Life History of Anopheles Punctipen- 

 nis and on the Egg-laying of Culex Pipiens : 

 Glenn W. Herrick 329 



Recent Zoo-paleontology : — 

 A Marsupial Evolution; Geology of the John 

 Day Basin; Discoveries of Plesiosaurus and of 

 Portheus: H. F. 330 



Botanical Notes : — 



Short Notes on Recent Books; Popularizing the 

 Study of Ferns : Professor Charles E. Bes- 

 sey 331 



The Preservation of Colorado Cliff Dwellings : Har- 

 lan I. Smith 333 



Presentation before the Faculty of Candidates for 

 the Doctorate at the University of Pennsylvania... 333 



Scientific Notes and News 338 



University and Educational News 344 



MSS. intended for publication and books, etc., intended 

 for review should be sent to the responsible editor, Pro- 

 fessor J. McKeen Cattell, Garrison-on-Hudson, N. Y. 



THE PROGRESS OF SCIENCE.* 



A CONSTITUTIONAL provision of our Asso- 

 ciation stipulates that " it shall be the duty 

 of the President to give an address at a 

 General Session of the Association at the 

 meeting following that over which he pre- 

 sided." Happily for those of us who must 

 in turn fulfill this duty, the scientific fore- 

 sight of our predecessors set no metes and 

 bounds with respect to the subject-matter 

 or the mode of treatment of the theme that 

 might be chosen for such an address. So 

 far, therefore, as constitutional requirements 

 are concerned, a retiring president finds 

 himself clothed for the time being with a 

 degree of liberty which might be regarded 

 as dangerous, were it not for an unwritten 

 rule that one may not hope to enjoy such 

 liberty more that once. But time and 

 place, nevertheless, as well as the painful 

 personal limitations of any specialist, im- 

 pose some rather formidable restrictions. 

 One may not tax lightly, even in a summer 

 evening, the patience of his audience for 

 more than an academic hour, the length of 

 which in most cases is less than sixty min- 

 utes. One must confine himself to general- 

 ities, which, though scientifically hazard- 

 ous, serve as a basis for semi-popular 

 thought ; and one must exclude technical 



* Address of the president of the American Asso- 

 ciation for the Advancement of Science, given at the 

 Denver Meeting, August 27, 1901. 



