SCIENCE 



Editoeial CoMsniTEE : S. Nbwcomb, Mathematics ; E. S. Woodward, Mechanics ; E. C. Pickeeing, 



Astronomy; T. C. Mendenhall, Physics ; E. H. Thurston, Engineering; Ira Rbmsen, Chemistry; 



J. Le Conte, Geology; "W. M. Davis, Physiography; O. C. Maesh, Paleontology; "W. K. Brooks, 



C. Hart Mkeeiam, Zoology; S. H. Scuddee, Entomology; C. E. Bessey, N. L. Beitton, 



Botany; Henry F. Osboen, General Biology; C. S. Minot, Embryology, Histology; 



H. P. BOWDITCH, Physiology; J. S. Billings, Hygiene ; J. McKeen Cattell, 



Psychology; DANIEL G. Beinton, J. W. Powell, Anthropology. 



Friday, June 24, 1898. 



CONTENTS: 



Models of Extinct Vertebrates : Peofessoe Henry 

 F. Osboen 841 



Natural Arches of Kentucky : Professor Aethue 

 M. MiLLEE 845 



The International Aeronautical Conference at Strass- 

 hurg : Peofessoe a. Lawrence Eotch 846 



The Field Columbian Museum 848 



Current Notes on Physiography : — • 



Ytikon Gold District ; Physical Geography of Wor- 

 cester, Mass.; Jamaica; Cuba; Appalachia: 

 Professor W. M. Davis 850 



Owrrent Notes on Anthropology : — 



37(6 Baiio of Buman Progress; The Italian Anthro- 

 pological Institute ; 'Organic' Sociology: Peo- 

 fessoe D. G. Beinton 851 



Notes on Inorganic Chemistry: J. L. H 852 



Scientific Notes and News : — 



The Royal Geographical Society ; Liquid Hydrogen; 

 General 854 



University and Educational News 859 



Discussion and Correspondence : — 



A Precise Criterion of Species : Dr. Feanz Boas..860 



Scientific Literature: — 



J. Bolyai's Scientia Spatii Absolute Vera and 

 Bolyai de Bolya's Tentamen : Peofessoe George 

 Bruc E Halsted. Sidis on the Psychology of Sug- 

 gestion : Peofessoe Wm. Eomaine Newbold. 

 Volkmann's Erkenntnistheoretische^ Orundzilge der 

 Naturwissenschaften and Pictet's Etude critique du 

 mat6rialisme et du spiritualisme par la physique ex- 

 perimentale: E. A. Steong. Butler on the 

 Meaning of Education : Professor Frank Mo- 



MURRY 861 



Societies and Academies : — 



The New York Section of the American Chemical 

 Society: De. Dueand Woodman. The Torrey 

 Botanical Club: Edward S. Buegess 867 



New Books 868 



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

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

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



MODELS OF EXTINCT VERTEBRATES* 

 There are certain obligations resting upon 

 the curators of metropolitan museums 

 from which curators of university mu- 

 seums should enjoy a grateful immunity. 

 These mainly involve the difiBcult un- 

 dertaking of arousing interest and spreading 

 accurate information among a very large 

 class of inquisitive but wholly uninformed 

 people. If these obligations are unfulfilled 

 the metropolitan museum fails in its pur- 

 pose and deserves the withdrawal of pub- 

 lic support. 



With this general idea in mind, members 

 of the Department of Vertebrate Paleon- 

 tology at the American Museum have 

 been making a special study of all 

 the legitimate methods of attracting 

 the attention and interest of visitors. 

 Among these methods are the series of 

 water- color restorations of extinct verte- 

 brates, executed by the animal painter, Mr. 

 Charles Knight, with the aid of various 

 scientific suggestions and criticisms. The 

 preparation of these drawings involves a 

 far more careful preliminary study than 

 would generally be supposed. The artist 

 begins by making a number of models in 

 wax, based upon the actual proportions and 

 muscular indications of the skeleton, and by 



* Catalogue of Casts, Models, Photographs and 

 Eestorations of Fossil Vertebrates, issued by the De- 

 partment of Vertebrate Paleontology, American Mu- 

 seum of Natural History, April, 1898. 



