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. 



Feiday, January 29, 1904. 

 contents: 



The American Assooiation for the Advance- 

 ment of Science: — 

 Section A, Mathematics and Astronomy: 



Pkofessor Labnas Giffoed Weld 161 



Section G, Botany: Pkofessor Francis E. 



Lloyd 165 



Geography in the United States, II. : Pro- 

 fessor W. M. Davis 1 78 



Karl Alfred von Zittel: Professor Henry 

 Fairfield Osborn 186 



Scientific Books: — 



The Moth Book: Dr. L. O. Howard. Ver- 

 worn's Allgemeine Physiologie: Professor 

 Frederic S. Lee 188 



Scientific Journals and Articles 190 



Societies and Academies: — 



The Academy of Science and Art of Pitts- 

 burg: Frederic S. Webster. Wisconsin 

 Academy of Sciences, Arts and Letters: E. 

 B. Skinner. Northeastern Section of the 

 American Chemical Society: Arthur M. 



COMBY 191 



Discussion and Correspondence : — 



Convocation Week: Professor E. L. 

 Nichols, Professor W. Lb Conte Ste- 

 vens, Professor J. S. Kingslet. The 

 Scintillations of Radium: Professor R. 

 W. Wood 192 



Sjyecial Articles: — 



The Occurrence of Zinc in Certain Inverte- 

 brates: Harold C. Bradley 196 



Atmospheric Nitrogen for Fertilizing Pur- 

 poses ■ 197 



Missouri Lead and Zinc Regions visited by 

 the Geological Society of America: Pro- 

 fessor A. R. Crook 197 



Scientific Notes and Neics 198 



University and Educational Neivs 200 



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

 for review should be sent to the Editor of Science, Garri- 

 Bon-on-Hudson, N. Y. 



THE AMERICAN ASSOCIATION FOR TEE 

 ADVANCEMENT OF SCIENCE. 

 SECTION A, MATHEMATICS AND 

 ASTRONOMY. 

 Vice-President — Otto H. Tittmann, Superin- 

 tendent U. S. Coast and Geodetic Survey, Wash- 

 ington, D. C. 



Secretary — Professor Laenas G. Weld, Univer- 

 sity of Iowa, Iowa City, Iowa. 



Member of Council — Professor Ormond Stone. 

 Sectional Committee — Dr. G. B. Halsted, Vice- 

 President, 1903; President C. S. Howe, Secretary, 

 1903; Superintendent O. H. Tittmann, Vice-Presi- 

 dent, 1904; Professor L. G. Weld, Secretary, 1904- 

 1908; Professor W. W. Benian, one year; Dr. J. 

 A, Brasliear, two years; Professor J. R. Eastman, 

 three years; Professor Ormond Stone, four years; 

 Professor E. B. Frost, five years. 



General Committee — Mr. Philip Fox. 



Professor Alexander Ziwet, of the Uni- 

 versity of Michigan, was elected vice-presi- 

 dent for the next meeting. 



The Chicago Section of the American 

 Mathematical Society and the Astronom- 

 ical and Astrophysical Society of America 

 met in affiliation with Section A. The pa- 

 pers presented before these affiliated socie- 

 ties will be noticed elsewhere. Those read 

 before Section A were as follows : 

 A Neiv Treatment of Volume: Professor 

 George Bruce Halsted, Kenyon Col- 

 lege, Gambler, Ohio. 

 In September, 1902, Poineare wrote in 

 his review of Hilbert's 'Grundlagen der 

 Geometric ' : " The fourth book treats of 

 the measurements of plane areas. If this 

 measurement can be easily established 

 without the aid of the principle of Archi- 

 medes, it is because two equivalent poly- 

 gons can either be decomposed into trian- 

 gles in such a way that the component tri- 



