CYTOMORPHOSIS 



form the leaf. Later the cells degenerate and die. The leaf 

 becomes dead and falls. It would be easy to lay before 



-Pa 



FIG. 21. 



FIG. 22. 



FIG. 21. Cytomorphosis of the cartilage cells. From a section of the vertebral 

 arch of a pig embryo, a-e, successive stages; in e, the letters kn refer to the limit of 

 the cavity which is no longer filled by the degenerating cell. 



FIG. 22. Epidermis from the sole of the domestic cat. Ba. Schi, basal germ 

 layer; Hor. La, hor. z, hor. z', horny layer formed by dead cells; ker. k, layer of cells 

 which are being cornified; Ml. La, middle layer of cells which are migrating upward 

 and at the same time enlarging; Pa, site of a hypodermic papilla. After K. A . Schnei- 

 der. 



