CHAP. XXV.] PHRENOLOGY: OLD AND NEW. 541 



C 1. Impressions (ill defined) of strain or 

 T). From Muscles. tension. 



(. 2. Impressions of pain (rare). 



( 1. Impressions (ill defined) of strain 01 

 c. From Fascia, Ten- \ 



, , ' < pressure. 



dons, and Bones. / T . * / \ 



^ 2. Impressions ot pain (rare). 



C 1. Impressions of contact or pressure 

 d. From Viscera. (rare). 



(. 2. Impressions of pain (more common). 



The different modes of sensibility both in Skin and in 

 Mucous Membranes are found to vary in their acuteness 

 in certain diseases of the Cord or Brain, quite out of 

 relation to one another. Thus the ability to discriminate 

 between heat and cold, or the sensitivity to painful im- 

 pressions may, either separately or together, be abolished 

 in parts which are still sensitive to impressions of con- 

 tact (tactile sensibility or touch proper), or vice versa. 

 Hence it is that some distinguished physiologists believe 

 these different kinds of Impressions to be conducted by 

 separate nerve fibres ; whilst others, with as much evidence 

 in favour of their view, consider that the same nerve fibres 

 are capable of being impressed in different modes, so as 

 to conduct different kinds of molecular vibrations and 

 that they may hence give rise to Impressions, whose 

 subjective phases differ to the extent above mentioned. 



Passing from considerations of this kind, we have now 

 to face the related, though much more important, set of 

 questions, as to the existence, nature, and origin of a 

 separate endowment, commonly spoken of as the Muscu- 

 lar Sense, These questions have much occupied the 

 attention of physiologists, pathologists, and psychologists 

 and especially the latter during recent years. So 

 much importance, indeed, is assigned to the ' Muscular 



