SCIENCE 



Editorial Committee : S. Nkwcomb, Mathematics ; R., S. Woodwakd, Mechanics ; E. C. Pickkeing, As- 

 tronomy ; T. C. Mendenhall, Physics ; R. H. Thueston, Engineering ; Iea Remsen, Chemistry ; 

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

 Invertebrate Zoology ; C. Haet Meeeiam, Vertebrate Zoology ; S. H. Souddee, Entomology ; 

 N. L. Beitton, Botany ; Heney F. Osboen, General Biology ; H. P. Bowditch, 

 Physiology ; J. S. BILLINGS, Hygiene ; J. McKbbn Cattbll, Psychology ; 

 Daniel G. Beinton, J. W. Powell, Anthropology ; 

 G. Beown Goode, Scientific Organization. 



Feidat, April 10, 1896. 



CONTENTS: 



The National Academy of Sciences and the Colleges 

 of the United States: Edwaed S. Holden 537 



I. 



...538 



Diffuse Beflection of ike Rontgen Rays : M 

 Pdpin 



A Method of Determining the Relative Transparency 

 of Substances to the Rontgen Rays : Wm. Lispen- 

 AED ROBB ■. 544 



An Apparatus for the Study of Sound Intensities : 

 Joseph Jasteow 544 



How Nature Regulates the Rains : E. L. rDLTON...546 



Omrent Notes on Anthropology : — 



The Question of the Celts; Danish Antiquities : 

 D. G. Beinton , 552 



Scientific Notes and News : — 



Astronomy: H.J. General 553 



University and Educational News 558 



Discussion and Correspondence : — 



Heredity and Instinct (II.): J. Maek Bald- 

 win. The X-Rays : John Daniel. Instinct : 

 J. C. Haetzell, Jk. Visualisation and Retinal 

 Image : HiEAM M. Stanley. Nanal Erosion : 

 G. W. Tower 558 



Scientific Literature : — 



Rlioads, Polar Hares of Eastern North America ; 

 Nehrling's North American Birds; Sclater and 

 Thomas^ Book of Antelopes: C. H. M. Blount 

 and Bloxam's Chemistry for Engineers and Manu- 

 facturers ; Laiigenbeck' s Chemistry of Pottery : 

 Feank H. Thoep 564 



Scientific Journals : — 



Tlie Journal of Geology 568 



Societies and Academies : — 



Geological Conference of Harvard University: T. 

 A. Jaggae, Je. Tfie Philosophical Society of 

 Washington : Beenaed R. Geeen. Tlie lorrey 

 Botanical Club : W. A. Bastedo. The Virginia 

 Academy of Science: W. Eael Rumsey 569 



New Books „ 572 



MSS. intended for publication and books etn., intended 

 lor review should be sent to the responsible editor, Proi. J. 

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



THE NATIONAL ACADEMY OP SCIENCES AND 

 THE COLLEGES OF THE UNITED STATES. 



The National Academy of Sciences was 

 incorporated by an Act of Congress in the 

 year 1863. It consists of 88 members at 

 present, and adds to its numbers annu- 

 ally seldom more tlian five members, and 

 often none. 



The following interesting table shows 

 how its members are distributed among 

 the faculties of the various Colleges in the 

 United States, according to the data avail- 

 able in the Lick Observatory. As our set 

 of college catalogues is not complete a few 

 errors may remain in this list. Professor 

 Hilgard has been kind enough to revise the 

 table before printing. Names in square brack- 

 ets belong,officially, in another category also. 



Albany: Museum of the State of New 

 York, (1): J. Hall. 



Albany : Union College (The Dudley 

 Observatory), (1): L. Boss. 



Balthnore : Johns Hopkins University, 

 (4) : W. K. Brooks, I. Eemsen, H. A. Bow- 

 land, [S. Newcomb] W. H. Welch. 



Berkeley: The University of California, 

 (4): G. Davidson, E. W. Hilgard, E. S. 

 Holden, Joseph Le Conte. 



Boston : The Society of Natural History, 

 (1): Alphffius Hyatt. 



Boston: The Mass. Inst. Technology, (2): 

 J. M. Crafts, F. A. Walker. 



Cambridge: Harvard University, (11): A. 

 Agassiz, H. P. Bowditch, W. G. Farlow, 



