ABSTRACT AND REVIEW 



97 



the outside of Sphaguum, grass leaves, etc., but sometimes 

 inside the Sphagnum cells with diatoms ingested, apparently 

 after their entrance into the cells. The ingested Algas are not 

 entirely digested, there being always left over the membrane, 

 and some grey or black granules, which are either egested 

 when next the creature creeps out as an amoeba, or if, as fre- 

 quently, a new cyst is formed inside the old one, are deposited 

 between the two. Once the contents of the cyst were observed 

 to divide, one half creeping out, the other re-encysting itself 

 with the previously ingested diatom ; and on another occasion, 

 after the cyst contents had divided, each half re-encysted, 

 the chromatophores of that half which contained the diatom 

 becoming quite pale (Fig. E). 



Jb'iG. E. — A cyst containing two daugliter -cysts : one of these, which has 

 pale chromatophores, contains a large diatom ; the other has dark brown 

 chromatophores. 



It very frequently happens that the amoebae re-encyst without 

 having ingested any food at all. The cause of this is probably 

 to be sought in differences of temperature and moisture ; if, for 

 instance, certain conditions were to induce rapid multiplica- 

 tion of nuclei without a corresponding development of chro- 

 matophores, the creature might give up almost entirely a 



VOL. 42, PART 1 . — NEW SEE. G 



