130 A STUDY OF SOME 



It is also a remarkable fact that the tremor so excited, or excited 

 by raising the iiead, cannot be quieted unless Mr. C. arises com- 

 pletely from the ground and lies down anew. 



It is not within the ])rovince of this monograph to speculate 

 upon this interesting case. However, a point that is of exceed- 

 ingly great interest is the diffusion of the convulsive movement 

 to other parts of the body, notably to the other arm. This fact 

 is exceedingly suggestive with regard to the spreading of the 

 tremor or clonic spasm in the artificially-induced convulsions. It 

 seems as though at times the opposite arm was obliged to take up 

 an overflow of nerve-force. 



It should be stated that Mr. C. is still able to arrest the move- 

 ment of the left arm, at least in part, by seizing it by the right 

 hand, very much in the manner described by Dr. Mitchell. 



Wheel-Photographs of Tremors. 



Mr. Muybridge having at his command a " Marey" wheel, the 

 writer resolved to test the possibility of photographing tremors. 

 The wheel, which contained eight fenestra, revolved before the 

 camera five times in two seconds, so that in the course of one 

 second twenty exposures could be made, or, in other words, the 

 interval of time between any two exposures was equivalent to 

 one-twentieth of a second. 



The first case selected was one of typical j)aralysis agitans. It 

 was a woman, fifty-six years of age, wlio gave the following his- 

 tory : About four years ago she had intense pain in the ankles 

 and shoulders. She described it as rheumatism. The ankles 

 were much swollen. After the pain subsided, slie began to have 

 shaking or trembling, especially in the left arm. It was not at 

 that time marked, if at all, in any other portion of the body. 

 At the time the photographs were made, however, the tremor af- 

 fected both arms about equally. She complained of burning 

 pain in the shoulders. The position she assumed was typical of 

 an advanced stage of the disease. When standing, the trunk and 

 head were thrown forward, the forearms partially flexed on the 

 arms, and the hands and fingers bent into the " writing hand." 

 The latter was in a constant, regular tremor. When she was 

 asked to move the arms, it was noticed the movements were ex- 



