Page:Microscopicial researchers - Theodor Schwann - English Translation - 1947.pdf/61

OF CARTILAGE 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.