no 



THE SCOTTISH BOTANICAL REVIEW 



Fig. 34 shows a longitudinal section of an embryo-sac of 

 the same species, of which the one-celled embryo {e, n) was 

 near the base of the sac. The endosperm already filled the 

 cavity of the sac with a large-celled tissue in some of whose 

 cells more than one nucleus was present. Fig. 39 shows a 

 large fusion nucleus made up of three nuclei which occupied 

 one of these cells. 



Figs. 37 and 38 show young embryos of A. modestum 

 situated at the chalazal end of the sac. In fig. 37 the embryo 



C 



Fig. I. — A, embryo-sac oi Aglaonenia comnnitaium, showing the laterally placed 

 embryo, ew., x 60. B, a similar embryo-sac of A, modestum ; the embryo is 

 at the base of the sac, x 80. C, three sections of a young embryo of A. 

 modest mil, x 160. 



{0) is still undivided, and in this case one of the synergidae 

 showed some evidences of degeneration. A more advanced 

 stage is figured in 38. This embryo was two-celled, and the 

 endosperm completely filled the embryo-sac. A still more 

 advanced stage of this same species is shown in fig. 41. The 

 embryo is an elongated mass of cells embedded in the endo- 

 sperm at the base of the sac. In this specimen the two types 

 of endosperm tissue were particularly distinct. The small- 

 celled, actively dividing layer next to the wall on the concave 

 side contrasted strongly with the larger, thinner-walled cells 

 filling up the rest of thesac. 



Text-figure i, C, represents three sections of the same 



