On the Relation of Muscle Sense to Pressure Sense ii 



ilar influence. It may be remarked that both reagents had taken, 

 before the beginning- of these experiments, numberless unrecorded 

 series of observation in the general work of the laboratory. Fur- 

 thermore, when a comparison is made between the records of the 

 experienced and naive reagents, there does not seem to be differ- 

 ence enough to warrant a conclusion that practice has any demon- 

 strable effect upon the power to discriminate pressure upon the 

 passive palm. A new reagent seems to show some uncertainty 

 at first, but that passes off after the first three or four sittings, 

 and afterwards the reagent does about as good work as the most 

 experienced. 



Certain individual dift'erences are with some assurance demon- 

 strable. These concern the native power to discriminate and the 

 personal attitude which the reagents assume toward the experi- 

 ment. Reagent W. shows a tendency to use H. and D. H. judg- 

 ments more frequently in cases of uncertainty than reagent B. 

 Such a tendency results in giving a lower percentage of correct 

 judgments under the standard and a higher percentage under the 

 compared pressures. In the following tabular statement the per- 

 centages of S. judgments in all sets of experiments for both re- 

 agents under the stimulus magnitudes that admit of comparison 

 are given : 



The differences here show what would be expected from the 

 predisposition in cases of doubt to render one kind of judgments 

 rather than the other. This individual difference comes out again 

 in the use which the two reagents make of D. S. and D. H. judg- 

 ments. Of such judgments reagent W. uses 115 and reagent B. 

 112. Reagent W. gives 19 D. S. judgments and 96 D. H. judg- 

 ments. Reagent B. gives 38 D. S. judgments and 74 D. H. judg- 

 ments. They both use about the same number of doubtful 

 judgments, but show a difference in distribution of the two kinds, 

 which favors the predisposition here mentioned. In some obser- 



185 



