

'^selves f 

 a the e ' 





■^ed by j^i 



on, and 



oduced 



S§ Until I 



r 



a 



?d 





t 



'itic animal' 



Dr. Gros bi 



^c occurrence cr 



^ 



^ 



» 



ed to increase it 

 ted into Ciliatd 



r 



r 



avinginhisiioS' 

 Per germs 



r 2l long 



ble conditio"*!; 



^tions that tbs 

 of Rotife 



I 



i 



I 



f 



ent 



e. 



He sa/s 



,.(v 



bien 



encore ss 



, ver) 



,many«f'-* 



es, 



511 



dii^ 



TII£ BE GINNINGS OF LIFE. 



489 



vesiculesj I'animalisation progressa, mais non plus en 

 faveur d'un organisme individuel superieurj et au lieu 

 de voir le contenu de cette chrysalide donner un Rota- 



/ • 



toire 



comme leurs congeneres anterieureSj on vit le 



vitellus se resoudrc a rinterieur du cocon en des organ- 

 ismes inferieurs^ ou pousser a Texterieur du cocon des 

 utricules hile% qui devenaient la source d'une nouvelle 

 generation dlnfusoires utriculeux ^/ 



But quite recently I was fortunate enough to observe 

 somewhat similar phenomena. The substance of some 



of the large thin-walled ^ eggs ' of Hydatina sent a was 

 seen to have undergone segmentation into about sixteen 

 spheres, each xi^Vir in diameter. The external layers 



>tifera. Hesaii 

 remained will 



ut three moiife of these soon became condensed into cyst-walls, whilst 



uce buds on it the internal substance of each of them, after under- 



^H 



going a series of molecular changes, resolved itself 

 into an embryo Oxytricha, some of which might be 

 seen revolving within their cysts. Some of this batch 

 of Rotifer *^ eggs' were seen to be filled with such sphe- 

 roidal masses, whilst others were observed in which a 

 few of the embryos had escaped from their cysts, and 



about as well-marked specimens of 



were swimmmg 



Oxytricha within the thin investing membrane of the 

 Rotifer egg 2. And on another occasion, when some 



^ Similar utricles developing into Vorticellce may, moreover, according 

 to Dr. Gros, be budded out even from Euglense which have undergone 

 no decolourization, and which, therefore, have no actual relation to 

 Rotifers. (See loc. cit., p. 475, PL Q\ fig. 10.) 



^ These organisms were almost precisely similar to those which pro- 

 ceeded from the Chlorococcus vesicles (see p. 467). 



