450 THE BEGINNINGS OF LIFE. 



of the Cladophora or Vaucheria type. This I have seen 

 myself on several occasions, and especially amongst one 

 set of Euglen^ which v^ere left partially exposed to the 

 air on some dead leaves. Some medium-sized specimens 

 assumed a spheroidal shape, whilst their corpuscles be- 

 came distinct and of a very bright-green colour. At the 

 same time the red spot disappeared and the investing 

 membrane became thickened. Some of these vesicles 

 gradually elongated into filaments almost as broad as 

 their matrices, across which dissepiments were formed 

 at intervals {m). The chlorophyll corpuscles in the fila- 

 ments continued to be of the same bright-green colour as 

 they were in the vesicle from which they had proceeded j 

 anS for a short distance from their origin some of the 

 filaments were invested by a thin sheath-like material_, 

 similar to what had previously constituted a kind of cyst 

 for the metamorphosing Euglena. Other specimens of 

 the same batch of Euglena were placed beneath a 

 covering glass and kept within a damp chamber for two 

 or three days, when some of them were found to have 

 assumed the appearance and languid movements of the 

 worm-like Euglenae to which I have already referred 

 (Fig. 85, e). The corpuscles in some oi them became 

 much elongated and the red speck disappeared. The 

 organisms then became motionless, and, instead ot 

 transforming into Closteria, grew into narrow filaments 

 of uniform diameter — in which the corpuscles were 

 rather sparsely distributed, although they continued to 

 have the same elongated appearance as they had in 



