Bui. 844, U. S. Dept. of Agriculture. 



Plate III. 



Fig. I. — Section of an Ovule of Melilotus alba after Fertilization. 



The stage of development is a little later than that shown in Plate II, figure 2. The embryo is 

 embedded deeply in endosperm tissue. X45. 



Fig. 2. — Section through an Ovule of Melilotus alba after the Embryo 

 is Nearly Half Mature. 



But little endosperm remains except in the ehalazal end, and very little remains of either the 

 nucellus or inner integument. The modifications which transform the outer integument into a 

 seed coat are well under way. Not only the outer layer of cells which becomes the Malpighian 

 layer is quite well modified, but also the layer beneath is being transformed into the osteosclerid 

 layer. X30. 



