The Development of Endosperm in Cereals. 109 



and retains its power of dividing until the grain is almost 

 mature. Aleurone grains then appear in the cells of the outer 



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Text Figure III. 

 Trans verge section of oat grain. 

 B — Endosperinic cambium shows two resting nuclei and one in mitosis. 

 A — Degenerating cells of walls of ovary. 



layer. The starch of the endosperm of oats is not in the form 

 of grains as in wheat and barley, but appears as rounded groups. 

 Each group is made up of a number of centres, of which there 

 appear to be more in the older than in the younger groups ; but 



