CHAPTER ELEVENTH. 



PECULIAR MODES OF REPRODUCTION. 

 SECTION I. 



GEMMIPAROTJS AND FISSIPAKOUS REPRODUCTION. 



328. WE have shown in the preceding chapter, that 

 ovulation, or the development of the embryo from the 

 egg, is common to all classes of animals, and must be 

 considered as the great law for the reproduction of species. 

 Two other modes of reproduction, applying to only a limited 

 number of animals, remain to be mentioned, namely, gem- 

 miparous reproduction, or multiplication by means of buds, 

 and fissiparous reproduction, or propagation by division ; 

 and also some still more extraordinary modifications yet in- 

 volved in much obscurity. 



329. Reproduction ~by buds occurs among the polyps and 

 some of the infusoria. On the stalk, or even 



on the body of the Hydra, and of many Infu- 

 soria (Fig. 132), there are' formed buds, like 

 those of plants. On close examination they 

 are found to contain young animals, at first 

 very imperfectly formed, and communicating 

 at the base with the parent body, from which 

 they derive their nourishment. By degrees the pig. 132. 

 animal is developed ; in most cases, the tube by which it is 



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