NORMAL AND ABNORMAL MOVEMENTS. 



131 



tremely slow and that the arms were very stiff. When she was 

 asked to walk she showed a marked tendency to fall forward. 



The head was not affected by the tremor, and was carried in a 

 rigid, fixed position. The patient never turned her head unless 

 specially asked to do so. 



The tremor appeared quite rhythmical, and when the writer 

 first saw the patient it entirely disappeared upon voluntary move- 

 ment. Later on, and at the time of making the photographs, it 

 ceased to disappear altogether, though it grew much less. 



In making the experiment, the patient, as in Marey's experi- 

 ments on the normal walk, was dressed in a suit of dark-blue 

 tights. On these a white stripe ran along the outside of the arm 

 from the shoulder to the wrist and hand, upon which a bright 

 metallic button was sewed. The legs were similarly striped. The 

 patient was then seated on a chair, and at a given signal she raised 

 both the arm and leg of one side. The result is shown in Figs. 

 24 and 25. 



Fig. 24. 



Fig. 25. 



In Fig. 24, the patient started to raise the arm a little after the 

 exposures with the wheel had commenced, consequently the stripe 

 down the arm was heavily photographed, and the two bright dots 

 seen at its lower end correspond to the rapidly-vibrating button 

 on the hand. Each successive stripe from below upward is still 

 tipped by a double dot, though the dots appear slightly closer 

 together. The interval between the dots is of course blurred. 



Another interesting fact is illustrated by this photograph. The 

 movement consisted in raising the hand to a level with the top of 

 the head. It is noticed that the movement is commenced slowly 



