634 PHTJSIOLOGT, 



pollen-tube iy always intact and without visible apertures, fc never con- 

 tains any cellular formation within it 



The arrival of the pollen-tnbe upon the surface of the embryo- 

 Kg- 615. Fig. 613. 



<l 



the embryo hMobfiteratcd the ndo*rm cod the wd c 



Kfr 612. Ap of tfi* embryos of w 

 F%. 613. 



sue is followed bj the development of one (rarely of more) of the 



