THE BEGINNINGS OP LIFE. 237 



it more equally, so as to leave a broad space between 

 the central mass and the thin walls of the containing 

 sphere. The measurements in this stage were found to 

 be as follows: containing sphere ^oVcr"? central nuclear- 

 like body 10 ^ 00 ", and surrounding mass of granules 

 _ IJ 1 5 _ // in diameter. Afterwards the central nuclear-like 

 body and the granular mass seemed to become lighter in 

 colour the former still exhibiting its slow oscillating 

 movements, whilst the latter had much increased 

 in size so as more nearly to fill the delicate cyst in 

 which it was contained (e}. Then the outlines of the 

 embryo gradually became more defined; three or four 

 other rather large granules appeared in the neighbour- 

 hood of the nucleus, and one crescentic portion of 

 the embryo-mass presented a smooth, glistening, and 

 homogeneous appearance. No later stages were traced ; 

 and though no movements of the embryo as a whole 

 were seen only movements of the nucleus there could 

 not be the shadow of a doubt that these bodies repre- 

 sented organisms of some kind, which were developing, 

 not from ova, but as a result of changes taking place 

 in the very substance of the pellicle itself. 



The intermediate connecting links between the 

 Flagellated Monads on the one hand, and such Ciliated 

 Infusoria as Paramectum and Kolpoda on the other, are 

 undoubtedly such forms as those which were included 

 by Dujardin in his genus Enchelys. They are scarcely 

 larger than many Monads ; they possess the same simple 



