324 
The Ohio Naturalist. 
[Vol. V, No. 6, 
latter was not seen divided and its nucleus was quite vescicular 
even in rather youn<f embryos (Figs. 23-24). The abundant 
endosperm com])letely surrounds the young embrvo which at 
first develo])s very slowly. The outer integument becomes very 
hard, the inner one and the nucellus remaining very spongy and 
giving way to the growing endosperm. Ovules which contained 
mature embryos were found in the ca])sules of the previous year. 
Hand sections showed a flat straight embryo with two cotyledons 
(Figs. 2b-27). There was no endosperm layer between the 
cotyledons. The hardening of the outer integument agrees with 
the observations of Guerin on Staphylea in his study of the seed 
integuments of some Sapindales. He also notes abundant 
“albumen” in both Staphylea and Melianthus. 
I wish to acknowledge my great indebtedness to Professor 
j. 11. Schaffner for his invaluable assistance, and to express my 
hearty appreciation of his kindness. 
Bibliography. 
Coulter & Cha.mberlaix. Morjihology of Angiosi^enns. H)()3. 
('lOEBEL. Outline Classification and Special Moqihology. 
(iuERix, F. Developpement de la graine et en particulier, du 
tegument seminal de quelques Sajnndacees. Journal de Bot- 
anique, IflOl : No. 10 1 1. 
Mottier, I). B. Develojmient of the embryo sac in Acer rub- 
rum. Bot. Gaz. 18:375 -377. 
Strasburger, Ed. Ueber Zellbildung und Zelltheilung. Jena 
Zeitschr. f. Naturw. Bd. XIII, Su]j]) 1. Heft 2, j). 50. bSSO. 
Strasburger, Ed. Neue Untersuchungen ueber den Be- 
fruchtungsvorgang bei den Phanerogamen. Jena. ISS4. 
Explaxatiox of Plates. 
For the figures 1-15 a Lcitz microsco])e with No. (i ocular and 
No. 7 objective for all but Figure 14 which was drawn with a 
lower power. A Bausch and Loml) instrument was used for all 
the other drawings. For Figure Ki the 1-2 ocular and 1-12 oil 
immersion were used. For Figure 17 the 1-in. octdar and 1-12 
objective; for Figures lS-22 the 1-in. ocular and 1-0 objective; 
for Figures 23-24 a 2-in. ocular and 1-0 objective and for Figures 
25-27 the 2-in. ocular and the upper lens of the 2-3 objective. 
PLATE XIX. 
Fig. 1. Archesporial cell. 
Fig. 2. Three celled arehesporium. 
Fig. :L Prinuirv jjarietal cell and niegas]>oroevte. Integuments 
beginning to develop. 
Fig. 4. Three tajietal cells and megasporoevtc. 
Fig. .■). Two ta])etal cells; megasporoevtc eidarging. 
Figs. (1-7. Four and five tapetal cells. 
Fig. 8. Four ta]>etal cells and four megasj)ores. 
