NORMAL AND ABNORMAL MOVEMENTS. 121 



almost unable to walk. Syphilis, though denied, was suspected 

 as a concomitant factor, and the man made marked improvement 

 under large doses of potassium iodide. 



It is to be noticed that the feet are thrown forward in a passive 

 or pendulum-like manner, and that the weight is not trusted to a 

 leg until it has been locked, — i.e., until the knee has been thrown 

 far backward (incurved), — so that collapse from sudden flexion 

 becomes impossible. 



In Plate 555 is seen the gait of a case of monoplegia. The 

 monoplegia is due to a commencing muscular atrophy affecting 

 the left thigh and leg. It is seen that the diseased leg is thrown 

 forward (see lower series) in the same helpless or pendulum-like 

 manner as in the case of paraplegia ; also (see upper series) that 

 the weight of the body is not thrown upon it until the knee has 

 been well locked. This is in marked contrast with the action of 

 the normal limb. (See plates of normal walk.) 



Again, the strange gait of Plate 558 is worthy of a word. 

 It is that of a case of stuporous melancholia. His history is 

 as follows. He is twenty-five years old. For thirteen years he 

 worked as a type-finisher, being constantly exposed to fine particles 

 of dust mixed with lead. Three years ago he had an attack of 

 acute lead -poisoning, with marked wrist-drop. A year later he 

 had a period of excitement, with evidences of insanity. He then 

 had hallucinations of sight and hearing, and had delusions of per- 

 secution ; thought his sister was trying to poison him, and that his 

 fellow-workmen were constantly endeavoring to have him dis- 

 charged. After being in this condition for about six weeks, he 

 became sullen and stuporous ; he would make no effort for him- 

 self; had to be fed and had to have all of his wants attended to 

 by his friends. His stuporous condition largely persists. He 

 does not speak and is apt to remain in positions in which he is 

 placed. His gait might be described as a crouching shuffle. It 

 is certainly in keeping with his mental condition. 



Another remarkable gait is that of a case of infantile paralysis, 

 which is depicted in Plate 539, and in which the child has 

 adopted the method of walking on all fours. The foot-falls, so 

 to speak, occur in the same order of succession as they do in the 

 walk of a quadruped. The case was under the care of Dr. James 

 H. Lloyd, of the University. 



