SCIENCE 



Peidat, January 24, 1913 



CONTENTS 



The American Assooiation for the Advance- 

 ment of Science: — 

 Atomic Theories of Radiation: Professor. 

 E. A. MlLUKAN 119 



Educational Diagnosis: Professor E. L. 

 Thoendike 133 



W. G. Wright : Fordyce Grinnell, Jr 142 



Scientific Notes and News 143 



University and Educational News 145 



Discussion and Correspondence: — 



Undergraduate Research Work in Medical 

 Schools: Dr. Paul G. Woolley. A Pro- 

 posal for the Control of Certain Mosqui- 

 toes : it'REDERICK Knab 146 



Scientific Books:— 



Kingsley's Comparative Anatomy of Verte- 

 brates: Professor 0. E. Bardeen. Lloyd's 

 The Groioth of Groups in the Animal King- 

 dom: Dr. Frank E. Lutz. Whitney's The 

 Flowing Road: Professor J. C. Branner 148 



Mineralogy in Japan: Dr. George F. Kunz 152 



The Docophori of the Oiols: Professor 

 Vernon L. Kellogg. (Enothera and Cli- 

 mate: Dr. R. E. Gates. Inheritance of the 

 Russet Shin in the Fear: Eichard Wel- 

 lington 154 



Societies and Academies : — 



Academy of Science of St. Louis: Pro- 

 fessor George T. Moore. The Botanical 

 Society of Washington: Dr. C. L. Shear. 

 The Anthropological Society of Washing- 

 ton: W. H. Babcock. TJie Elisha Mitchell 

 Scientific Society : James M. Bell 156 



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

 review should be sent to Professor J. McKeen Cattail, Garrison- 

 on-Hudson, N. Y. 



TEE AMERICAN ASSOCIATION FOR THE 

 ADVANCEMENT OF SCIENCE 

 ATOMIC THEORIES OF RADIATION^ 

 Twenty years ago the system of theo- 

 retical physics seemed so complete as to 

 justify the opinion, not infrequently ex- 

 pressed, that it was probable that the great 

 discoveries in physics had all been made, 

 and that future advances were to be looked 

 for in the sixth place of decimals. And 

 yet, in the very midst of these predictions, 

 came the announcement, made just eight- 

 een years ago this week, of Roentgen's dis- 

 covery which showed that there were great 

 mines of physical gold as yet unworked. 

 Since that time discoveries of fundamental 

 importance have followed one another with 

 such amazing frequency that one who is at 

 all familiar with the history of physics will 

 scarcely challenge the statement that the 

 past fifteen years is quite unparalleled in 

 the number and the significance of its ad- 

 vances. At the present time, too, the air 

 is full of suggestion of still more funda- 

 mental developments. 



Most of these recent advances find a place 

 under the general title, ' ' The Triumphs of 

 an Atomistic Physics." Within the past 

 decade, the atomistic conception of matter 

 has silenced the last of its enemies, and to- 

 day we are counting the number of atoms 

 and molecules in a given mass of matter 

 with as much certainty and precision as we 

 can attain in counting the inhabitants in 

 a city. No census is correct to more than 

 one or two parts in a thousand, and there 



^ Address of the vice-president and chairman of 

 Section B — Physics — American Association for the 

 Advancement of Science, Cleveland, December, 

 1912. 



