RECORDS OF MEETINGS OF 1907 325 



Papers. 



William M. Campbell, The Effect of Pressure on INIagnetization of 



Iron. 



J. Stewart Gibson, Results of a Series of Experiments on the 



Critical Angle; Its Effect on Vision from 

 Underneath the surface of Water. 



SuM3kL\RY OF PaPERS. 



Professor Campbell's paper referred briefly to the Kirclioff theory on 

 the effects of stress deduced from the strains due to magnetization, to the 

 experimental work done by ^Yassmuth, Tomlinson, Nagaoka and Honda 

 and Miss Frisbie, and the contradictory results they obtained. Then fol- 

 lowed a description of the apparatus used by the writer, the method of 

 conducting the experiment and the results. Higher pressures were used 

 in magnetizing fields stronger than those used by other investigators. Keep- 

 ing the pressure constant and changing the field, the results showed an 

 increase in intensity up to about eighteen units of field, then a decrease 

 with a change of sign at about H = 90 units, and a continual decrease with 

 increase of field. 



The Section then adjourned. 



William Campbell, 



Secretary, 



SECTION OF ANTHROPOLOGY AND PSYCHOLOGY. 



IMarch 25, 1907. 



Section met at 8:15 P. M., in conjunction with the American Ethno- 

 logical Society, General J. G. Wilson presiding. 



The minutes of the last meeting of the Section were read and approved. 

 The following program was then offered: 



Frederick S. Dellenbaugh, Some Notes on the Disintegration of the 



Tribes of Oklahoma. 

 Franz Boas, Notes on the Pawnee Language. 



The Section then adjourned. 



R. S. WOODWORTH, 



Secretary. 



