LSI 



IIARDWiCKE'S SCIENCE- GOSSIP, 



duced from the ova. Some of them when first 

 observed are a mere rounded lump, showing the 

 tentacles like a star (as shown on fig. 95), others I 

 find as it were in a more advanced slate, as that 

 marked litr. 96, but without a footstalk or sucking 

 disk. And again others with a very short footstalk, 

 as in fig. 97; and so on until they commence budding 



.^^^"^^ 



are produced from ova. There is another way of 

 multiplying the Hydra besides gemmation and ova- 

 tion, which is by mechanical subdivisions; that is, 

 by cutting them into slips as you would plants. 

 Ti'.is I have proved several times, and now have 

 some on which I have tried the experiment. In one 



Fig. 97. Development of Foot-stalk, 

 in the usual way. So I think it very feasible that 



Fig-. B8. Development of Foot-stalk, 

 the small Hydras that appear in tlic early spring 



Fig. TQ. Hydra a'tacking Water-flea. 



glass there arc eight Hj'dras whicli are the results 

 of my cutting four into parts. Cuttin'^- them does 



Fig. 100. Hydra wiiliout tentacles. 



not appear to aCTect them much, for the part con- 

 taining the tentacles, when severed, sinks gradually 

 to the bottom of the glass, with the tentacles still 



