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 ; K. S. Woodward, 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. Osborn, Paleon- 

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

 Bessey, N. L, Britton, 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, November 8, 1901. 



CONTENTS : 

 The American Association for the Advancement of 



Science: — 



Supplementary Report on Non-Euclidian Geome- 

 try : Professor George Bruce Halsted... 705 



Section H, Anthropology : DR. George Grant 



MacCurdy 717 



Early Winter Colors of Plant Formations on the 



Great Plains : Professor Charles E. Bessey. 721 

 Rudolph Koenig : PROFESSOR W. LeConte 



Stevens 724 



Scientiftc Books : — 



Recent Books on Hygiene : DR. Geoege M. 



KoBER. Britton's Manual of the Flora of the 



Northern States and Canada : Professor 



Charles E. Bessey 727 



.Scientific Journals and Articles 733 



Discussion and Correspondence : — 



West Virginia University. Cannonade Against 



Rail Storms : Professor Cleveland Abbe. 



The Sacramento Forest : Dr. Robert T. Hill.. 735 

 The Work of the Beaufort Laboratory of the U. S. 



Fish Commission: Professor H. V. Wilson.. 739 



A Students^ Society of Science 740 



Scientific Notes and News 740 



University and Educational News 744 



MS8. intended for publication and books, etc., intended 

 for review stiould be sent to ttie responsible editor. Pro- 

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



SUPPLEMENTARY REPORT ON NON-EUCLID- 

 EAN GEOMETRY. 



When at the Columbus meeting of the 

 American Association I had the honor of 

 making a ' Eeport on Non-Euclidean Geom- 

 etry,' it was mentioned that my own ' Bibli- 

 ography of Hyper-space and Non-Euclidean 

 Geometry,' in the, American Journal of Math- 

 ematics (1878), giving 81 authors and 174 

 titles, when reprinted in the collected works 

 of Lobachevski (Kazan, 1886) gives 124 

 authors and 272 titles ; while Roberto 

 Bonola had just given (1899) a ' Bibliog- 

 raphy of the Foundations of Geometry in 

 Relation to Non Euclidean Geometry,' con- 

 taining over 350 titles with some repeti- 

 tions. 



Bonola in 1900 finished a second part of 

 this bibliography, in which the single section 

 headed ' Historical, Critical and Philosoph- 

 ical Writings ' gives 96 authors and 150 

 titles. It thus becomes very evident that 

 a most important function of your reporter 

 is the selection of what writings to bring 

 forward for especial mention as of para- 

 mount importance and typical of the main 

 stream of advance. 



In the Columbus report I particularly 

 stressed the work of two authors whom I 

 brought forward together and to whom I 

 devoted about a quarter of that report. 



The report first appeared in Science for 

 October 20, 1899, and you may imagine 



