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. 



Editokial Committee : S. Newcomb, Mathematics ; E. 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. Scxjdder, Entomology ; C. E. 

 Bessey, N. L. Beitton, 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 15, 1901. 



CONTENTS : 



The American Association for the Advancement of 

 Science: — 



The Geology of Ore Deposits, I.: Professor C. 

 R. VanHise 745 



The Physical Sciences at the British Association: 

 Dr. A. Lawrence Rotch 757 



Scieniific Books : — 

 Bernadou on Smokeless Poxcder : Professor 

 Charles E. Muneoe. Leffmann and Beam on 

 Food Analysis: Dr. H. W. Wiley. Packard's 

 History of 3Iedicine in the United States : E. F. 

 C 767 



Scientific Journals and Articles 771 



Societies and Academies : — 



American Mathematical Society : Peofessoe F. 

 N. Cole. Section of Geology and Mineralogy at 

 the New York Academy of Sciences : Peofessoe 

 R. E. Dodge. Botanical Seminar of the Uni- 



■ versity of Nebraska 772 



Discussion and Correspondence : — 

 Preglacial Drainage in Southivestern Ohio : Pees- 

 ident W. G. Tight. Permanent Skin Deco- 

 ration : H. Newell Waedle. Magazine En- 

 tomology : Martha McCulloch-Williams, 

 J. B. S 775 



Current Notes on Physiography : — 



The High Plains of Colorado, Kansas and Texas ; 

 South Shore of Hudson Strait; The Origin of 

 Waterfalls: PEOFESSOE W. M. Davis 778 



Current Notes on 3Ieteorology : — 

 Meieorologiral Equipment of the ' Discovery ; ' 

 Charles Meldrum ; Bibliography: PROFESSOR 

 R. Dec. Ward 779 



Scientific Notes and News 780 



University and Educational News 783 



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

 for review shiould be sent to the responsible editor, Pro- 

 fessor J. McKeen Cattell, Ga.rrison-on-Hudson, N. Y. 



THE GEOLOGY OF ORE DEPOSITS* 

 I. 



I SHOULD hardly have ventured to talk on 

 the subject of ore deposits to an audience 

 which contains many men much more 

 familiar with mines than I, if I had not ap- 

 proached the subject from a different point 

 of view. The point of view from which the 

 subject of ore deposits has been most fre- 

 quently considered has been that of a study 

 of ore deposits themselves. A geologist or 

 mining engineer has studied this or that 

 ore deposit, or a number of ore deposits in 

 different districts, and has then generalized 

 concerning the ore deposits of other districts, 

 and perhaps of the world. I also have con- 

 sidered the subject of ore deposits to some 

 extent from that point of view, but if I had 

 done this only, I should not have ventured 

 to give a general address upon the subject. 



A number of years ago I began the study 

 of the alterations of all rocks, by all proc- 

 esses and by all agents, in order, if pos- 

 sible, to ascertain how it is that the rocks 

 change from one form to another. That 

 rocks are metamorphosed has been known 

 for many years. It has been realized that 

 one mineral changes into another mineral ; 



* The Popular Scientific Lecture of the American 

 Association for the Advancement of Science, compli- 

 mentary to the citizens of Denver, delivered at 

 Denver, Col., in the High School Auditorium, Mon- 

 day evening, August 26, 1901. 



