l/J^^^ 



^^^tal 



r, 



' -^fe 



f«i».:. ! 



ifu 



nt 



and }^ 



re ofte 



f«: 



H \ 



''""lUii, 



Ho 



I 



''^"§ matter,, 



'S pointed out |! 

 ^^^'^nty years | 



r^, he said ;^t ; 



^, 



)niens, 



i;;, 



Lssula, etc, recff. 

 ire vegeto-animi:' 

 cendance et 



\ 



\^W 



Fb^M 



:?rtissent en It 



tinuer I'echelkf: 



des Cilit's. "• 



s'en fe 



rivancCj 



roteen et m 



4 



» 



g"" 



;. 



on 



Infusoria, in '^' 



Fcrent 

 0^ gre^^ 



e 



to 



other 



.xter.al»' ' 



ves 



in 



a 



^Vithi'^ 



thi 



;cc(?' 



77/^ BEGINNINGS OF LIFE. 



501 



the contracted mass of living protoplasm undergoes 

 processes of molecular rearrangement, varying in nature 

 at different times, but generally resulting in a transforma- 

 tion into other forms 1. Thus it may undergo segmen- 

 tation into Monads or into Pythium corpuscles j it may 

 emerge as a whole in the lower form of an Amoeba or 

 Actinophrysj or it may make its appearance as a totally 

 different Ciliated Infusorium : whilst we have now to 

 admit that on other occasions, as Dr. Gros long ago 

 pointed out, the encysted mass may undergo a totally 

 different set of molecular changes — changes of a higher 

 kind— so that ultimately it becomes converted into an 

 embryo of one or other of the small Rotifers. Such 

 a transformation, according to Dr. Gros, is liable to 

 occur occasionally amongst all sorts of Ciliated Infu- 



soria. He says 



II restera prouve aussi qu 



Cfc 



les 



Keroniens^ les Dileptiens, les Oxytriques, les Coccu- 

 dines, etc,^ peuvent coconner (PL O, figs. 13, 4, 5^ 



PL Pjfigs. i-ic), et domier iiaissance a des Rotatoires/ 



Whilst 



says 



3 



Utriculeux 



andcurdes^*^ des Euglenes passeront souvent les uns dans les autres, 



Rotatoires 



leu 



r 



espece 



It has, moreover, long been known that the ap- 

 pearance of Rotifers in infusions is frequently preceded 

 by the presence of successive forms of Ciliated In- 



See p. 467, note i. 



Log. cit., p. 456. 



Loe. cit., p. 299; see also p. 310 



\ 



