EECENT RESEARCHES ON THE EADIOLAEIA. 



163 



having rounded edges and angles with an organic appearance, and 

 being insoluble in both acids and alkalies. 



By degrees the crystals, fat-granules, and nuclei become aggre- 

 gated, so that each capsule is found to contain small bodies, each 



Fig. 10. 



■Jiv^ m 





Contents of a capsule of Collozoum inerme, with the bodies above described. 

 y, yellow cells. (After Hertwig.) 



of which consists of a nucleus with a crystal and some fat-gra- 

 nules. The oil-globules have disappeared, having served to form 

 the fatty granules. 



At this stage of development the whole colony sinks, the alveoli 

 dwindle and disappear, and the different capsules become aggre- 

 gated together towards the middle of the mass. At this stage 

 also a colony will fall asunder with the slightest disturbance, the 

 separated capsules bursting and letting out the contained small 

 bodies, which have already began to show a tumultuous motion. 

 When discharged, these small bodies are seen to be zoospores, 

 which are at first lively, but which Hertwig found to die in an hour. 



Each of the contained bodies or zoospores is oval, with a single 

 flagellum placed at one end, the motion of which is exceedingly 

 lively, so that it might easily be taken for two flagella ; and it is pos- 

 sible that Oienkowski may therefore have been mistaken in attri- 

 buting two flagella to each zoospore of CollosphcBra. At that end of 



