THE BEGINNINGS OF LIFE. 



405 



FIG. So. 

 Higher Transformations of the substance of Nitella. ( x 600). 



a. A large Amoeba resulting from the transformation of a single 



embryonal sphere, 



b. Form of Actinophrys which such an Amoeba may subsequently assume. 



c. Small embryonal mass which has assumed an ovoid form, and sub- 



sequently becomes concerted into a kind of Paramecium (c'). 



d. Similar mass, rather larger, which becomes flattened, and subse- 



quently develops into an embryo Chilcdon (d'}. 



e. A complex egg-like body into which individual embryonal spheres were 



very prone to develop ; the central mass of protoplasm containing 



large granules and a vacuole. 

 /. Later stage of same body central mass of fatty-looking globules, 



which subsequently becomes homogeneous and enclosed within 



another cyst, as in g. 

 b. Later stage of development as seen in a few embryos, which may or 



may not have escaped from their loose outer envelope. 



8. On other occasions nearly all the embryonal 

 spheres within a given internode may, almost imme- 



