The Development of Endosperm in Cereals, 



107 



of the embryo-sac are the first-formed endospermic nuclei, 

 which have been formed from the secondary nucleus after fertili- 

 sation. These appear as a group of free nuclei lying in the 

 protoplasmi of the embryo-sac. This, according to Goebel, 





Tkxt Fig d re I. 

 Longitudinal section of young ovary of barley after fertilisation. 

 A — First endospermic nuclei. 

 B — Nucellus. 

 C — Ovular integuments. 

 D — Wall of ovary — later pericarp. 



