RECORbS 153 



resulting silt is carried and deposited as fine mud. This paper 

 was discussed by Dr. Grabau. 



Dr. W. S. Yeates, State Geologist of Georgia, being present 

 as a visitor, the chair called upon him for remarks. In response 

 he gave a brief outline of the State Geological Surveys of Geor- 

 gia, and made a short statement of the work now in hand. Re- 

 marks appreciative of the difficulties under which state geolog- 

 ical surveyors often labor were made by Professors Stevenson 

 and Kemp, and Mr. G. F. Kunz. 



The Section adjourned at 9:30 o'clock. 



Edmund O. Hovey, 



Secretary. 



SECTION OF ANTHROPOLOGY AND PSYCHOLOGY. 



November 25, 1901. 



Section met at 8:20 P. M., Professor Livingston Farrand 

 presiding. 



The minutes of the last meeting of Section were read and 

 approved. 



The following program was then offered : 



Robert MacDougal, Combination of Simple Rhythm 

 Groups in Higher Syntheses, and their Equivalences. 



E. L. Thorndike, The Correlation of Mental Abilities. 



J. Franklin Messenger, An Experimental Study of Num- 

 ber Perception. 



Summary of Papers. 



Professor MacDougal has found that the simplest rhythmic 

 units are always combined into larger groups, provided only the 

 units succeed each other with sufficient rapidity. And these 

 larger groups may be combined into others still larger — a pro- 

 cess to which no definite limits can be set. The simplest group 

 of rhythmic units is the pair or dipody, which appears in every 

 rhythmic series that admits of such grouping. The means by 

 which this coupling of the units is accomplished in poetry are : 

 Subordination of the accent of one unit to the accent of the 



