CHAPTER ELEVENTH. 



PECULIAR MODES OF REPRODUCTION. 

 SECTION I. 



GEMMIPAROITS AND FISSIPAROUS REPRODUCTION. 



328. WE have shown in the preceding chapter, that ovula- 

 tion, and the development of embryos from eggs, is common 

 to all classes of animals, and must be considered as the great 

 process for the reproduction of species. Two other modes 

 of propagation, applying, however, to only a limited number 

 of animals, remain to be mentioned, namely, gemmiparous 

 reproduction, or multiplication by means of buds, and fissip- 

 arous reproduction, or propagation by division ; and also 

 some still more extraordinary modifications yet involved in 

 much obscurity. 



329. Reproduction by buds occurs among the polyps, me- 



dusse, and some of the infusoria. On the stalk, 

 or even on the body of the Hydra, (Fig. 132,) 

 and of many infusoria, there are formed 

 buds, like those of plants. On close exam- 

 ination they are found to be young animals, 

 at first very imperfectly formed, and commu- 

 nicating at the base with the parent body, 



from which they derive their nourishment. By 

 Fig. 132. . 



degrees, the animal is developed ; in most 



cases, the tube by which it is connected with the parent 



