THE BEGINNINGS OF LIFE. 461 



might still remain, and also, an aggregation of partly 

 greenish and partly brown granular matter in the more 

 central parts of the animalizing mass, representing the 

 as yet unmetamorphosed portion of the green contents 

 of the Euglena (Fig. 86, a). Cilia are not usually pro- 

 truded at such an early stage as this, although on one 

 occasion in which the transformation was scarcely so 

 advanced, almost motionless cilia were seen to exist. 

 This was in an ovoid transforming Euglena which still 

 contained a number of minute green corpuscles, mixed 

 with granular matter in different stages of decoloriza- 

 tion, and also a large colourless nuclear corpuscle at 

 one extremity (). The whole body was motionless, 

 though it was uniformly fringed with short and very 

 languidly moving cilia, which had all the appearance 

 of having been recently protruded. Cilia first appear, 

 as I have frequently observed, in the form of minute 

 motionless protrusions, which gradually elongate and 

 soon begin to exhibit very slow vibrations. In the 

 course of from fifteen to twenty minutes they may be 

 observed to have attained a medium length, whilst 

 they exhibit languid but regular movements. The cilia 

 are protruded after precisely the same fashion as the 

 rays of an Actinophrys, and these latter are also, like 

 the cilia, almost always motionless at first 1 . 



On other occasions the Euglena undergoes a complete 



1 In the origin of the Amoeba itself the same sort of progression is 

 noticed. The colourless protoplasm, when it begins to move, moves 

 only very slowly, and it very gradually acquires an increased mobility. 



