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. 



Editoeial Committkb : S. Nkwcomb, Mathematics ; R. S. Woodward, Meohaoios ; E. C. Pickbriko 

 Astronomy ; T. C- Mkndenhall, Phywos ; R. H. Thurston, Engineering ; Ira Rbmsen, Chemistry ; 

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

 tology ; W. K. Brooks, C. Hart Merbiam, Zoology ; S. H. Scuddee, Entomology ; C. E. 

 Bessey, N. L. Bbitton, Botany ; C. S. Minot, Embryology, Histology ; H. P. 

 BowDiTCH, Physiology ; William H. Welch, Pathology ; 

 J. McKben Cattell, Psychology. 



Friday, September 25, 1903. 



COXTEXTS: 

 The Address of the President of the British 

 Association for the Advancement of Science: 

 Sns Norman Lockyer 385 



Mendel's Law of Heredity: Professor \V. E. 



Castle 396 



Wilbur Clinton Knight: Aven Nelson 406 



Scientific Books: — 



Schneider's ' Lehrbuch der vergleichenden 

 Histology der Tiere: Dr. Burton D. Myers 409 



Societies and Academies : — 



The American Mathematical Society: Pro- 

 fessor F. N. Cole 410 



Discussion and Correspondence: — 



Tosnc Effects of Acids on Seedlings: F. K. 

 Cameron 411 



Shorter Articles: — ■ 



Primitive Flageolets : E. H. Hawley 412 



Scientific and Technical Examinations 413 



Scientific Xotes and News 413 



University and Educational News 415 



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

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

 fessor J. McKejn Cattell, Oarrlson-on-Hudson, N. Y. 



ADDHESS OF THE PRESIDENT OF THE 

 BRITISH ASSOCIATION FOR THE 

 ADVANCEMENT OF SCIENCE. 

 THE INFLUENCE OF BRAIN-POWER ON HIS- 

 TORY. 



My first duty to-night is a sad one. I 

 have to refer to a great loss which this Na- 

 tion and this Association have sustained. 

 By the death of the great Englishman and 

 great statesman who has just passed away, 

 we members of the British Association are 

 deprived of one of the most illustrious of 

 our confreres. We have to mourn the loss 

 of an enthusiastic student of science who 

 eonfeiTed honor on our body by becoming 

 its President. We recognize that as Prime 

 Minister he was mindful of the interests of 

 science, and that to him we owe a more gen- 

 eral recognition on the part of the State of 

 the value to the nation of the work of sci- 

 entific men. On all these grounds you will 

 join in the expression of respectful sym- 

 pathy with Lord Salisbury 's family in their 

 great personal loss which j'our council has 

 embodied this morning in a resolution of 

 condolence. 



Last year, when this friend of science 

 ceased to be Prime Minister, he was suc- 

 ceeded by another statesman who also has 

 given many proofs of his devotion to philo- 

 sophical studies, and has shown in many 

 utterances that he has a clear understand- 

 ing of the real place of science in modem 

 civilization. We then have good grounds 



