928 SPASMODIC RIGIDITY. [BOOK m. 



reflex should be used to denote such phenomena ; but the pheno- 

 mena themselves deserve attention, especially perhaps as shewing 

 how in the disorders of the grey matter of the cord due to 

 disease impulses or influences which are latent only in health 

 become actual and effective. 



It remains for us to speak of the part played by the spinal 

 cord, as the instrument of the brain, in the execution of voluntary 

 movements and in the development of conscious sensations ; but it 

 will be best to consider these matters in connection with the brain 

 itself, to the study of which we must now turn. 



