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CHAPTER XIX. 



METHODS AND APPARATUS FOB OBTAINING GRAPHIC 

 RECORDS OF MOVEMENTS IN THE LIMBS, ETC., 

 AND ENUMERATING SUCH MOVEMENTS AND 

 THEIR COMBINATIONS ; PROBLEMS TO BE INVES- 

 TIGATED BY THESE METHODS. 



Movement as a result of vital action is capable of physical experi- 

 mentation Early attempts to record movements Apparatus 

 described : the motor gauntlet ; the recording tambours ; the 

 contact-making tambour ; electrical counter ; method of using 

 the apparatus Problems ; as to muscular twitching in exhaus- 

 tion Movements of an infant Inhibition by light Measure- 

 ment of differentiation of movements Retentiveness Signs 

 of emotion Potentiality for mind Co-ordination Athetosis 

 Chorea. 



THROUGHOUT this essay I have endeavoured, as 

 far as possible, to describe modes of expression in 

 terms of movements and results of movements. 

 This has been done purposely, for it has long been 

 my conviction that, of all the results of vital action, 

 movement is the outcome or result most suitable 

 for direct experimentation. 



About five years ago I commenced some experi- 

 ments with the object of producing a mechanical 



