-^ 



Fie. 5. 



FiK. 4. 



Embryogeny of Santalum album. (All magnified 400 diameters ) 



All the figures represent the upper end of the embryo-sac (after soaking in spirit, 

 by which the protoplasmic contents are coagulated) : figs. 1 and 2, just before the 

 pollen-tube comes into contact; figs. 3 — 5, after it has descended and become adhe- 

 rent to the embryo-sac. The letters have the same significance in all the figures. 

 a. The protoplasmic germinal corpuscle which becomes the embryonal cell, b and 



c. Two protoplasmic corpuscles, which always occupy the apex of the sac {coayula). 



d. Protoplasmic substance in " primordial utricle " of the embryo-sac coagulated 

 and contracted, e. Membrane of the ernbryo-sac. /. Starch-granules, p. Pollen- 

 tube, a'. The cellulose membrane of the fertilized germinal corpuscle, now become 

 a perfect embryonal cell. 



