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. 



Friday, Novembee 4, 1904. 



CONTENTS: 

 The Physical Properties of Aqueous Salt Solu- 

 tions in Relation to the Ionic Theory: 

 Pkofessor Akthub a. Notes 577 



The Field of Logic: Professor Frederick J. 



E. WOODBEIDGE 587 



Clarence L. Herrick : Professor A. D. Cole . . 600 



Scientific Books: — 



The liarriman Alaska Expedition: C. L. 

 Marlatt. Halter's Lehrbuch der ver- 

 gleichenden Anatomic : J. P. McM 601 



Societies and Academies : — 



The San Francisco Section of the Ameri- 

 can Matliematical Society: Professor G. 

 A. Miller. New York Academy of Sci- 

 ences, Section of Geology and Mineralogy: 

 Edmund Otis Hovey. The Elisha Mitchell 

 Scientifio Society: Professor Alvijst S. 

 Wheeler 604 



Discussion and Correspondence : — - 



Soil Management : Professor E. W. Hil- 

 GARD. 'The Metric Fallacy' once more: 

 Professor W. Le Conte Stevens. Pro- 

 fessor William Morton Wheeler on the 

 Kelep : 0. F. Cook 605 



Special Articles: — 



The Brain of a Stoedish Statesman: Dr. 

 Edw. Anthony Spitzka 612 



Scientific Notes and Neics 613 



University and Educational News 616 



MSS. inteuded for publicatiou and books, etc.. intended 

 for review should be sent to the Editor of Science, Garri- 

 son-on-Hudson, N. Y. 



THE PHYSICAL PROPERTIES OF AQUEOUS 



SALT SOLUTIONS IN RELATION TO 



THE IONIC THEORY.* 



It is generally recognized that the fur- 

 ther progress of physical science will be 

 greatly facilitated by a better systematiza- 

 tion of the knowledge already accumulated, 

 and this is true in an especially high de- 

 gree of the newly developed branch of 

 science in which this section is directly 

 interested. It has, therefore, seemed to 

 me that the most valuable contribution that 

 I could make toward the solution of the 

 present problems of physical chemistry in 

 correspondence with the aims of this Con- 

 gress, would be a formulation of the pres- 

 ent status of some of our knowledge re- 

 lating to important classes of phenomena 

 which are being actively investigated, but 

 ■which have not yet received a final inter- 

 pretation. It was my original hope to 

 discuss several such classes of phenomena; 

 but the effort involved in the collation and 

 criticism of the available data connected 

 with the problem which was first studied, 

 forced me to confine my attention to that 

 alone. This problem concerns the physical 

 properties of aqueous salt solutions in re- 

 lation to the ionic theory. This is the sub- 

 ject which I shall attempt to present to 

 you: I hope that its importance and the 

 greater definiteness that can be given to 

 its treatment may compensate for the some- 

 what limited scope of this paper. 



Permit me to say in advance that I have 



* Address delivered at St. Louis befoi-e the Sec- 

 tion of Physical Chemistry of the Congress of 

 Arts and Science. 



