150 EEPEODUCTION IN PLANTS AND ANIMALS. 



movable phytozoon. There is, therefore, more analogy be- 

 tween the fecundating matter of Cryptogams and that of ani- 

 mals, than between the fecundating matter of Phanerogams 

 and that of animals. The fine movable corpuscles or fovilla 

 which may be seen in the fertilizing flviid matter which 

 descends the pollen tube to the embryo sac where formerly 

 thought to be spermatozoa; but they are only molecules of 

 starch, being colored blue by iodine. They are not sperma- 

 tozoa, as a great many authors have thought. 



