244 THE GENESIS OF SPECIES. [CHAP. 



come condensed in the cells which constitute the organs of 

 a sexual or agamic reproduction (buds, spores, bulbilli, 

 portions of the body separated by scission, &c.)." 



"6. By means of the germinative affinity, every gemmule 

 (except in cases of anomalies or monstrosities) can be 

 developed only in cells homologous with the mother-cells 

 of the cell from which they originated. In other words, 

 the gemmules from any cell can only be developed in 

 unison with the cell preceding it in due order of succes- 

 sion, and whilst in a nascent state." 



"7. Of each kind of gemmule a great number perishes ; 

 a great number remains in a dormant state through many 

 generations in the bodies of descendants; the remainder 

 germinate and reproduce the mother-cell." 



" 8. Every gemmule may multiply itself by a process of 

 scission into any number of equivalent gemmules." 



Mr. Darwin has published a short notice in reply to 

 Professor Delpino, in Scientific Opinion of October 20, 1869, 

 p. 426. In this reply he admits the justice of Professor 

 Delpino's attack, but objects to the alleged necessity of the 

 first subordinate hypothesis, namely, " that the emission of 

 gemmules takes place in all states of the cell." But if this 

 is not the case, then a great part of the utility and distinc- 

 tion of Pangenesis is destroyed, or, as Mr. Lewes justly 

 says: 1 "If gemmules produce whole cells, we have the 

 very power which was pronounced mysterious in larger 

 organisms." 



Mr. Darwin also does not see the force of the objection 

 to the power of self-division which must be asserted of 

 the gemmules themselves if Pangenesis be true. The 

 objection, however, appears to many to be a serious one. 



1 fortnightly Review, New Series, vol. iii. April 1868, p. 508. 



