400 THE OUTGO OF ENERGY 



of the hand. Determine whether the increase 

 or the corresponding decrease in temperature is 

 the more painful to the immersed hand. 



MOTOR SENSATIONS 



Judgment of Weight. Lift the same weight 

 twice, at first very slowly and then quickly. 



The weight will appear lighter when raised 

 quickly. 



Sensation of Effort. " Hold the finger as if to 

 pull the trigger of a pistol. Think vigorously 

 of bending the finger, but do not bend it. 



" An unmistakable feeling of effort results. 



" Repeat the experiment, and notice that the 

 breath is involuntarily held, and that there are 

 tensions in other muscles than those that would 

 move the finger." (Sanford.) 



Sensation of Motion. Let the forearm and 

 hand rest upon a table. Bring the four fingers 

 of the hand together, and turn the hand so that 

 it shall rest upright upon the ulnar side of the 

 little finger. Close the eyes. Abduct the first 

 finger. 



The second, third, and fourth finger will seem 

 to move in a direction opposite to the movement 

 of the first. 



