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. 
