would answer me that he was a subject 

 composed of a number of very curious 

 materials, put together in the most artifi- 

 cial manner, and formed into muscles, 

 fibres, arteries, veins, nerves, blood, &c.&c. 

 so nicely contrived to act in unison, that 

 from his birth to his death, a never ceas- 

 ing motion and circulation is kept up. 

 So that, when viewed in this light, he ex- 

 hibits a system of mechanism which 

 appears wonderful even to the most en- 

 lightened artist. The dependence of all 

 which parts upon one another are so con- 

 nected, that the whole becomes diseased 

 from the slightest injury being given to 

 any one part, be it ever so minute. 



Now, was the same question put to 

 the generality of persons as to their 

 knowledge of an apple or pear tree, they 

 would answer, that it was composed of 

 leaves, branches, trunk, roots, &c. ; that 

 it had a tendency to increase in size, 

 and, like a man, it was fond of nourish- 

 ment, and throve most in such soils as 

 suited it best. But, were I to put the 

 same question to one who had considered 



