212 E. B. TITCHENER— ETHNOLOGICAL TESTS OF SENSATION. 



landers — McDougall describes it as " a combination of the method of 

 minimal changes with the method of right and wrong answers "^^ — 

 bears all the earmarks of an incomplete psychophysical method. My 

 criticism, in brief, is that fragments or sections of established methods 

 cannot, without very rigorous trial and definite proof of reliability, 

 be combined to form a new method. 



The aim of McDougall's procedure, on the quantitative side, was 

 to get eight correct dual judgments out of a possible ten. I have be- 

 fore me the data of a careful performance of Whipple's test (1910) 



13 R, 191. 



