NORMAL AND ABNORMAL MOVEMENTS. 



123 



Fig. 15. 



ever, as both the plates and figures show, the results were by no 

 means unsatisfactory. 



In Fig. 15 the position 

 of the subject and the early 

 stages of an induced convul- 

 sion are shown. The figure 

 is the result of a number of 

 tracings of the serial photo- 

 graphs of Plate 54f5, lower 

 series, being superimposed. 

 The tremor is just being 

 magnified into to-and-fro 

 movements of the hands and 

 feet. A photograph of this 

 stage was also made by 

 means of a " Marey wheel," 

 and is shown in Fig. 16. 

 The blurring of the hands and feet here show the extent of the 

 convulsion. 



Fig. 17 is the result of superimposed tracings of the upper 

 series of pictures in Plate 545. In this instance the subject was 



simply seated on a chair facing 

 the cameras. There was no 

 table used. The model had 

 already induced a number of 

 convulsions, and was now 

 asked to induce a convulsion 

 by keeping the fingers in deli- 

 cate contact with the thighs. 

 In a short time, as shown by 

 the figure, a most violent con- 

 vulsion was the result. 



The individual pictures of 

 this series are especially inter- 

 esting. The entire pose or attitude assumed by the subject is, 

 so to speak, hysteroidal, while the purposeless movements of the 

 limbs suggest those of chorea, than which, however, they are 

 infinitely more rapid. 



In Fig. 18, which is the result of a superimposed tracing of 



Fig. 16. 



