Explanation of Plate 1 
Fig. 1. The fundament of the nucellus, 670 
Fig. 2. The archesporial cells, of which only two are seen in the section, have be- 
gun to be differentiated. They apparently underlie only one epidermal capping ce ell. 
Fig. 3. The archesporium more strongly developed. The p ericlinal divisions 
seg the capping epidermal cells mark the beginning of the ی‎ of the integu- 
ie. 4. Transverse section through archesporium ; it is composed in this instance of 
twelve cells, X 670. 
ig. 5. Integument is well marked; maximal elongation of archespori 
disintegration of some of the inner cells has begun, X 670. | 
Fi Somewhat older condition of the ovule in which the archesporial cells are 
preparing for division ; micropylar canal is begun, X ۰ 
Fig. 7. First division of the archesporial cells. The arrow is directed toward the 
position of the micropyle, X 670. 
Fig. 8. A still more ارت روت‎ condition of the ovule in which the micropylar pi 
is. > The سس‎ division is taking place in some of the archesporial cells, X ۰ 
. 9. Definitive megaspore. On the right one sees imperfectly formed and de- 
97 megaspores, X 670, 
al cells; 
(23) 
