102 1MIYS10LOGY. 



to them, and will thereby be rendered the most irritable ; so 

 that the * strictius regimen' gives the appearance of irritability . 

 " Fifthly : the different state of mobility of the muscular 

 fibres, depends upon the state of the brain communicated to 

 them ; and here I would repeat the same reasoning as I did in 

 pointing out that sensibility and vigour are communicated from 

 the brain ; as every part of the nervous system communicates, the 

 condition of one part will be communicated to every other, and 

 therefore the different states of mobility in the brain must affect 

 the muscular fibres with the same state." 



CHAP. III. OF THE FUNCTIONS OF THE BRAIN. 



" I here employ the term BRAIN in the same general meaning 

 I did before, as comprehending the whole medullary substance 

 within the cranium and vertebral canal : the cerebrum, strict- 

 ly so called, the cerebellum, medulla oblongata, and spi- 

 nalis. It may be necessary to distinguish these parts in treat- 

 ing of some of the functions, but it is not necessary to do so 

 throughout. 



" The Stahlians and some of the physiologists have taken 

 a fancy that the soul has no seat, no particular part of the body 

 with which it is connected more than the rest ; but that it is co- 

 extensive with the nervous system, perceives in the organs of 

 sense, independently of any communication with the brain, and 

 operates in the muscles without any motions propagated from 

 the brain to the muscles. But in saying this, they cannot but 

 be stumbled by what I have added :" 



CXVI. From the effects of ligatures made upon the nerves, 

 and of the destruction of their continuity, it appears, that, in 

 their entire state, motions may be communicated from the brain 

 to the other parts of the nervous system, and from the latter to 

 the former ; and, from the same experiments, it appears, that 

 the brain (XXIX. 1.) is the organ of sensation and volition, 

 and of the several intellectual operations intervening between 

 these: all which is confirmed by the effects of the organic 

 affections of the brain upon the intellectual faculties. 



CXVU. The brain is thus the sensorium or corporeal organ 

 more immediately connected with the mind ; and, so far as a 



