OF CARTILAGE. 35 



We have seen the generation of cells within cells, and the 

 formation both of the young cells in cartilage, and of the 

 true cartilage-cells themselves, was proved to take place 

 around the nucleus, in the same manner as that described 

 by Schleiden in vegetable cells. The other proof for the 

 accordance of animal and vegetable structure (see Introduction, 

 p. 6) yet remains to be supplied, viz. that most or all animal 

 tissues are developed from cells. If this proof only were 

 furnished, the analogy of such cells to the elementary cells of 

 plants would at once become extremely probable ; we may now 

 assert that analogy so much the more firmly, since the cells 

 of two distinct tissues have been proved in detail to correspond 

 with those of plants. 



