Febeuaey 5, 1897]. 



SCIENCE. 



213 



ination of roughness of surfaces and touching a spot 

 previously touched should he tried. C. J. W. 



Hveness to Pain : B. C. J. S. W. 

 The gradually increasing pressure that will just 

 cause pain. The point or points in the body to he 

 used to he agreed upon. B. C. J. W. 



Perception of Weight or of Force of Movement : B. C. 



J. S. W. 



Arrange a series ot weights. B. J. W. 



Make movements of equal force and determine the 

 error. C. 



The best method still to he developed. J. 



Dynameter Pressure of Right and Left Hands : B. C. J. 



S. W. 



Dynamometer. B. 



In place of or in addition to the ordinary dyna- 

 mometer test make movements of the thumb and fore- 

 finger and continue as rapidly as possible for fifteen 

 seconds. C. 



Use mechanical counter for this and take reading at 

 end of every minute. S. 



Thumb and finger dynamometer. Record best and 

 worst of five trials. "W. 



Pate of Movement : W. 



Distance of 35 cm. One preliminary trial with 

 right hand in extension, then two trials in succession 

 of E. E., L. F., L. E., E. F. Collate shortest of two 

 trials under each typical movement. "W. 



Fatigue : B. C. W. 

 Muscular exertion. B. W. As described above. C. 

 Intellectual exertion. B. W. 



Will Power : W. 



The ability of the subject to respond after fatigue 

 has set in to a suggestion of the experimenter with an 

 extra effort of will. W. 



Voluntary Attention: 



Test by simple mental operations under distrac- 

 tion. B. 



Coincident variations in Psycho-physical process. 

 W. 



The modifiability of the knee jerk, or of a sus- 

 tained bodily process, such as rate of breathing or 

 pulsation of a volitional muscular or intellectual pro- 

 cess, when the subject's attention is engaged by some 

 mental content. W. 



Measure at the same time concentration or distrac- 

 tion of attention. W. 



Bight and Left Movements : J. W. 



The accuracy with which movements are made to 

 the right and left. J. W. 



Some such test as this for indication of right and 

 left-handedness. W. 



I do not insist on this test as one of great impor- 

 tance. J. 



Bapidity of Movements : C. J. S. W. 



Taps on a telegraph key. J. W. 



Movements requiring force, as described above. C. 



Make short marks as rapidly as possible for twenty 

 or thirty seconds, e. ^., | | | | |. S. 



Trilling with two fingers and with five. W. 



Accuracy of Aim : B. J. S. W. 



Throwing a marble at a target. .1. 



Or striking a point upon the table with a pencil 

 point. W. 



Touch an insulated spot, as proposed by Scripture. 

 S. B. Also for steadiness of hand. B. 



Beaction-iime on Sound : B. C. J. S. W. 



The reaction to be made with the right hand with 

 a signal about two seconds before the stimulus. B. 

 C. J. W. . 



Five reactions to be made without preliminary 

 practice; after the reactions have been made, the ob- 

 server to be asked whether the direction of the atten- 

 tion was motor or sensory. B. C. 



It is not much use to ask for direction of attention 

 with most subjects. W. 



Sensory and motor reaction with instruction, after 

 the above test. B. 



Beaction-time with Choice : B. J. W. 

 Use card sorting. B. J. S. 



Bate of Discrimination and Movement : B. C. J. S. W. 



100 A's in 500 letters to be marked or as many as 

 can be marked in one minute. B. C. 



One out of a number of geometrical forms to be 

 marked : determine the number marked in 90 sec- 

 onds. J. W. 



Or colors, or pictures of objects. "W. 



Quickness of Distinction and Slovement: B. J. S. 



Rate at which cards are sorted. B. J. S. 



Combine with reaction with choice. B. 



With the effects of practice, etc., as proposed by 

 Bergstrom. S. 



Perception of Size : C. J. S. W. 



Draw a line equal to a model line 5 cm. in length, 

 bisect it, erect a perpendicular of the same length 

 and bisect the right-hand angle. C. J. 



Perception of Time : B. C. J. S. W. 



The accuracy with which a standard interval of 

 time, say ten or twenty seconds, can be reproduced. 

 C. W. 



Thirty seconds or one minute. W. 



