NEW YORK ACADEMY OF SCIENCES 569 



increases quite rapidly at first, as the proportion of graphite 

 is decreased, then more slowly, and after a time reaches a critical 

 point where there is no conduction or the graphite is destroyed 

 by arcing. 



When the percentage of the conducting powder is low, a 

 mechanical separation or "striation" takes place on packing 

 in the refractory tubes. Besides this an electrolytic separation 

 usually takes place after a time and the conductivity* of the 

 mixture is destroyed by arcing. 



A very great variety of substances and mixtures were experi- 

 mented with in the search for a permanent compound of high 

 resistance. C. C. Trowbridge, 



Secretary. 



SECTION OF ANTHROPOLOGY AND PSYCHOLOGY. 



January 30; 1905. 



The Section met at 4.15 p.m. at Columbia University, and at 

 8. 15 p.m. at the American Museum of Natural History, Vice- 

 President F. E. Woodbridge presiding. 



The minutes of the last meeting of the Section were read 



and approved. 



The following program was then offered : 



* 

 At the afternoon session: 



R. S. Woodworth and 

 F. G. Bruner, Color Preferences. 



M. Tsukahara, The Relation of Intensity of Sensa- 



tion to Attention. 

 Dickinson S. Miller, Ideas and Temperaments. 



At the evening session : 



Robert MacDougall, Organic Levels in the Evolution of 

 the Nervous System. 



Robert MacDougall, Note on Number Habit. . 



W. P. Montague, Relational Theories of Consciousness. 



Charles H. Judd, Radical Empiricism and Wundt's Phi- 

 losophy. 



