THE CELL DOCTRINE. 43 



tion. And in his third series, p. 529, he says, " The 

 germinal vesicle does not burst, or dissolve away, or 

 become flattened on or before the fecundation of the 

 ovum as hitherto supposed. It ceases to be pellucid." 

 And on page 531, " The germinal vesicle tills with 

 cells, and these become filled with the foundations 

 of other cells; so that the germinal vesicle is gradu- 

 ally rendered opaque." 



He also describes in this series, in great detail, the 

 mode in which these cells are produced from the 

 germinal spot, which he considers in the light of a 

 nucleus to the germinal vesicle. Part II, 1839, p. 360. 

 And though the minute details may not precisely 

 accord with those of the most recent observations, 

 the correct idea is clearly grasped. In fact, it may be 

 said that in minuteness of detail alone does he differ 

 from later observers, and had he simply stated that 

 the young cells arise from the nucleus or nucleolus of 

 the parent cell, he would accord precisely with the 

 most recent observers. But he is, if possible, even 

 more explicit when he says, "The process inherited 

 from the germinal vesicle by its offspring, reappears 

 in the descendants of these. Every cell, whatever its 

 minuteness, if its interior be discerned, is filled with 

 the foundations of new cells, into which its nucleus 

 has been resolved." Again he says,* " Schleiden has 

 seen the nucleus undergoing such changes (division), 

 but failed to recognize them." And finally, in "Phi- 

 losophical Transactions" for 1841, pp. 207-8, we 

 have the following striking paragraphs, which would 

 seem also to correct some previous errors : 



* Barry, Philosophical Transac., 1840, p. 348, g 385. 



