43 



muscles is fatigued, or when it is feeble, 

 their vibratory or tremulous motions are 

 manifest to common observation, but the 

 same kind of motion may be perceived 

 at all, times by attention, as has been 

 shewn by Doctor Woolaston in the 

 Croonian Lecture for the year 1810. It 

 is then I think manifest, that Mr. Hunter's 

 conjectures are tl>e most probable of any 

 that have been offered as to the cause of 

 instability. 



My allotted time does not permit me at 

 present to consider the other vital functions ; 

 yet I relinquish the subject with reluc- 

 tance, because I have been speaking only 

 on that point in which it seems most 

 difficult to persuade the incredulous, of the 

 probability and rationality of Mr, Hunter's 

 Theory. 



When hereafter I shall have to" speak 



