^J 



of the inner seed coat. The di f Perentiation of tliis 

 layer is phown mainly by the larr;er size oT its (^ells, 

 especially at the tip of the nucellns and by the crown- 

 ed cell contents v/hich takes up blue stains very read- 

 ily. This layer is the only part of the nucellus that 

 permanently resists the action of tiie endosperm (^ic« 

 30), and it is completed across the re^-ion of the chal- 

 VLza , so that it entirely surrounds the endosperm. Tts 

 nuclei are usually applied to the outer coll v/all, and 

 help, doubtless, in makinf^ the clear meiabrane whicli 

 surrounds the nucellus ("^if^. 30). It is thrown into 

 folds shortly before the ripening; of tne seed. ( Fig. 31 ) 

 The endosperm is finally stored with food in the form 

 of proteid r^rains. These, shortly before ripeninr; shovv 

 numerous {globoids CPig. 32) which disappear later. The 

 ripe endosperm contains in its cells much oil alonp; 

 with proteid material. In the cell walls are itnbedded 



