THE OVARIAN EGG. 279 



Multiplication by division occurs also normally 

 in adult animals that have completed their growth. 

 This is especially frequent among Worms ; and 

 strange to say, there are species in this Class 

 which never lay eggs before they have already 

 multiplied themselves by self-division. 



Another mode of increase is that by budding, 

 as in the Corals and many other Radiates. The 

 most common instance of budding we do not, 

 however, generally associate with this mode of 

 multiplication in the Animal Kingdom, because 

 we are so little accustomed to compare and gen- 

 eralize upon phenomena which we do not see to 

 be directly connected with one another. I allude 

 here to the budding of trees, which year after 

 year enlarge by the addition of new individuals 

 arising from buds. It must be remembered here 

 that I use the word individual simply in its scien- 

 tific sense, as designating singleness of existence, 

 and I trust that its usual acceptation will not 

 prevent a correct appreciation of the true re- 

 lation of buds to their parents and to the beings 

 arising from them. All buds have the same 

 organic significance, whether they drop from the 

 parent stock to become distinci individuals in the 

 common acceptation of the term, or remain con- 

 nected with the parent stoek, as in Corals and in 

 trees, thus forming growing communities of com- 

 bined individuals. Nor will it matter much in 



