360 



PROVISIONAL HYPOTHESIS Chap. XXVII; 



course of the male element. J. Miiller and others admit that 

 ovules and buds have the same essential nature; and in the 

 case of Daphnia Sir J. Lubbock first showed that ova and 



pseudova are identical in structure. Certain bodies, which 

 during their early development cannot be distinguished by any 

 external character from true ovules, nevertheless must be classed 

 as buds, for though formed within the ovarium they are incap- 

 able of fertilisation. This is the case with the germ-balls of 

 the Cecidomyide larvae, as described by Leuckart. 5 Ovules 

 and the male element, before they become united, have, like 

 buds, an independent existence. 6 Both have the power of trans- 

 mitting every single character possessed by the parent-form. 

 We see this clearly when hybrids are paired inter se, for the 



•s of either grandparent often reappear, either perfectly 

 gments, in the progeny. It is an error to suppose 

 that the male transmits certain characters and the female 

 other characters ; though no doubt, from unknown causes, one 



sex sometimes has a stronger power of transmission than the 

 other. 



It has been maintained by some authors that a bud differs 

 essentially from a fertilised germ, by always reproducing the 

 perfect character of the parent-stock; whilst fertilised germs 

 become developed into beings which differ, in a greater or less 

 degree, from each other and from their parents. But there is 

 no such broad distinction as this. In the eleventh chapter 



numerous cases were given showing that buds 



sionally 



grow into plants having new and strongly marked character, 

 and varieties thus produced can be propagated for a length 

 of time by buds, and occasionally by seed. Nevertheless, it 

 must be admitted that beings produced sexually are much more 

 liable to vary than those produced asexually ; and of this fact a 

 partial explanation will hereafter be attempted. The variability 

 m both cases is determined by the same general causes, and is 

 governed by the same laws. Hence new varieties arising from 



Aui? C Tl , dlsto § uished frM * those arising from see d. 

 Although bud-varieties usually retain their character during 



5 On the Asexual Reproduction of ° Spp „ nmo Mr , 1 , , 



Cecidomyide Larva, translated in head I v Z ht? ? f^T T 



'Annals and Mag. ofNat. Hist./ March, & Nat ^SS^r An ^f* deS 

 18G6,pp, 167, 171. . 138 Zoolo o-> 3rd series > 1850, p. 





