1932] Garden Pea and White Sweet Clover 83 



Fig. 6. Malpighian cells and osteosclerid cells fourteen days after pollination. 

 (xlSOO). 



Fig. 7. Malpighian and osteosclerid cells sixteen days after pollination, (x 1500). 



Fig. 8. Malpighian cells of a medium hard seed showing the first appearance of 

 the liglit line. (x]r)00). 



Fig. 9. Malpighian cells of a hard seed with wider light line and smaller pro- 

 portion of lumen. (xl500). 



Fig. 10. Malpighian and osteosclerid cells of a soft seed, showing narrow light 

 line and large lumen, (x 1500). 



Fig. 11. Malpighian cells of a hard seed stained in mass, domes heavily stained 

 but none has passed into or through the light line. (xl500). 



Fig. 12. Cross section through domes. (xl800). 



Fig. 13. Cross section just below the light line. (xlSOO). 



Plate 6. Pisum sativum. 

 Fig. 1. Ovule wall before pollination. (xl500). 

 Fig. 2. Ovule wall shortly after fertilization. (xl500). 

 Fig. 3. Portion of ovule wall about four days after pollination. (xl500). 

 Fig. 4. Malpighian cells about ten days after pollination. (xl500). 

 Fig. 5. Malpighian and osteosclerid cells about fifteen days after pollination. 



(x640). 

 Fig. 6. Malpighian cells of a mature seed, (x 1500). 



Fig. 7. Cross section of Malpighian cells just under the cuticle. (xlSOO). 

 Fig. 8. Malpighian cells of a hard seed, very much reduced lumen. (xl500). 

 Fig. 9. Malpighian cells of a soft seed, with lumen extending nearer the cuticle. 



(xl500). 

 Fig. 10. A single Malpighian cell treated with iodine and sulphuric acid. Much 



swollen, and blue except at triangular shaded portions which are 



yellow. (xl500). 

 Fig. 11. Cross section of Malpighian cells where the lumen appears. (xl800). 



