RECORDS OF MEETINGS 257 



found that there was movement in the rock through which the tunnel 

 passed, after the concrete was placed and put under test. Various ex- 

 planations have been suggested for this movement, and consequent leak- 

 age from the tunnel. Dr. Berkey's explanation involved the question 

 of the movement dependent upon this known tendency of the rock to 

 relieve the strain under which it is subjected. It is thought that the 

 bursting pressure of the water when the test was made tended to add to 

 the natural tendency of the rock, and the result was a movjement which, 

 except for this help, would probably not have taken place. Movement 

 to the extent of jostling the blocks in the complexly fractured granite 

 was aided by the escaping water, which tended to wash out the soft clay- 

 like gouge which normally fills many of the crevices or joints. The 

 chance of being able to stop the leakage under these circumstances 

 seemed so remote that it was finally decided to construct a new section 

 of tunnel at this point at a lower level, to avoid the imstable condition 

 that had been encountered. The interesting phenomenon from a geo- 

 logical standpoint is the fact that the rock had the appearance at all 

 times during construction of being one of the most substantial and 

 stable sections in the whole Aqueduct line. 

 The Section then adjourned. 



Chestek a. Eeeds, 



Secretary. 



SECTION OF AlVTHEOPOLOOY AND PSYCHOLOGT 



28 Februaey, 1916 



The Section met at 8 p. m.. Prof. E. S. Woodworth presiding. 

 The minutes of the last meeting of the Section were read and ap- 

 proved. 



The following program was presented : 



Russel L.Gould, Tests oe Manual Acouraoy oe PEE-vocATioisrAL 



School Boys. 

 G. C. Myers, Association" and Classieication. 



Edith F. Mulhall, Tests oe the Memoey oe School Childebn. 

 J. L. Stenquist, Tests oe Mechanical Ability. 



SUMMAEY OE PapEES 



Mr. Gould stated that the tests were undertaken for the purpose of 

 oifering some possible data on the efficacy of the newly established Et- 



