THE BEGINNINGS OF LIFE. 



379 



description of the changes taking place within this 

 cell, and of the ultimate metamorphoses undergone by 

 the liberated cell contents. 



The previously green contents having become of a 

 brownish colour, and the transparent cell-wall fully 

 formed, Mr. Carter says l : c A new substance, con- 

 sisting of a bluish semi-transparent mucus, more or 



FIG. 75. 

 Heterogenetic Origin of Monads from Nitella. (Carter.) ( X 350.) 



a. Contents of new-formed Cyst separating into protoplasm and dark 



brown refuse matter. 



b, c, and d. Segmentation of the protoplasm into Monads, which after- 



wards escape from the ruptured Cyst. 

 *,/, g. Different forms of the Monads. 



b, i, and j. Forms of Amoeba and Actinophrys which the Monads 

 subsequently assume. 



less charged with minute granules (from which its 

 colour appears to be derived), and refractive globules of 



1 Ann. of Nat. Hist.' vol. xvi. p. 5, 



