X.] PANGENESIS. 229 



" 2. The quantity of gemmules emitted from every cell 

 is very great. 



" 3. The minuteness of the gemmules is extreme. 



" 4. The gemmates possess two sorts of affinity, one of 

 which might be called propagative, and the other germina- 

 tive affinity. 



" 5. By means of the propagative affinity all the 

 gemmules emitted by all the cells of the individual flow 

 together and become condensed in the cells which compose 

 the sexual organs, whether male or female (embryonal vesi- 

 cle, cells of the embryo, pollen-grains, fovilla, antherozoids, 

 spermatozoids), and likewise flow together and become con- 

 densed in the cells which constitute the organs of a sexual 

 or agamic reproduction (buds, spores, bulbilli, portions of 

 the body separated by scission, etc.). 



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

 (except in cases of anomalies or monstrosities) can be devel- 

 oped only in cells homologous with the mother-cells of the 

 cell from which they originated. In other words, the gem- 

 mules from any cell can only be developed in unison with 

 the cell preceding it in due order of succession, and while 

 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 

 Prof. Delpino, in Scientific Opinion of October 20, 1869, 

 p. 426. In this reply he admits the justice of Prof. Del- 

 pino'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 dis- 



