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assert, that the ultimate muscular fibres 

 are continued throughout the whole length 

 of a muscle. How marvellous, (could we 

 but see it,) would such a slender thread 

 appear, continued throughout the whole 

 length of the human sartorius. Haller, 

 however, affirms, that the fibres are not 

 continued, but that one set terminating 

 another begins. Suspecting that Haller 

 employed the solar microscope on this 

 occasion, as he says he had done on others, 

 I examined muscular fibres with this in- 

 strument. Now though I place no con- 

 fidence in my own observation, and think 

 the subject unimportant as to any con- 

 clusion that may be deduced from it, 

 yet I will tell you how a portion of a 

 muscle appeared to me when magnified 

 about 500 times. The fibres were slight- 

 ly undulating, and one set terminating, 

 another began : neither were the sets of 

 fibres of considerable length. The mus- 



