112 BOTANICAL GAZETTE [AUGUST 
of other angiosperms; as to the presence of antipodals, which 
are certainly present and normal in number in C. stricta; as to 
the relation of endosperm formation to the time of fertilization, 
Treub reporting much endosperm before fertilization, and in 
C. stricta fertilization clearly taking place before endosperm- 
formation. 
The additional facts, not observed by Treub, are the occur- 
rence of “double fertilization,’ and the presence of two sperms, 
spherical in the pollen tube and crescentic in the sac. 
My thanks are due to Professor John M. Coulter and Dr. 
Charles J. Chamberlain for valuable assistance in the prosecution 
of the work and in the publication of the results. 
MORNINGSIDE COLLEGE, 
Sioux City, Iowa. 
LITERATURE CITED. 
1. CHAMBERLAIN, C. J., Bor. Gaz. 21: 374. 1896. 
2. Frye, T.C., A morphological study of certain Asclepiadaceae. Bot.Gaz. 
34: 389-413. Als. 17-15. 1902. 
s hated D. S., On the development of certain Piperaceae. BOT. GAZ. 
> 321-340. pls. g—so. 
4. "ied E., Lehrbuch der Botanik 409. Jena. 1900. 
5. TReEuB, M., Sur les Casuarinées et leur place dans le systeme naturel. 
Ann, Jard, Buitzenborg 10: 145-231. és. 72-72. 1891. 
EXPLANATION OF PLATE XVII. 
All drawings were made with a Bausch & Lomb camera lucida, 7, ¢ 12 
(oil) objectives, and nos. 1 and 2 oculars. The figures have been reduced 
one half, but the original magnifications are given. 
Casuarina stricta Ait. 
Fic. 1. Young ovule: z, nucellus; 7, inner integument; /, loculus with- 
out ovule, X 207. 
Fic. 2. Ovule: , nucellus; 0, outer integument; 2, inner integument. 
xX 140. 
Fic. 3. Nucellus about same stage as in fig. 2; a, cells which may be 
archesporium. X 1366. 
Fic. 4. Nucellus with hypodermal periclinal wall-formation, suggesting 
that a — be primary wall cells, and 4 primary sporogenous cells. X 1366. 
G. 5. Nucellus, suggesting that interior cells 7 arise from hypodermal 
ee at apex. xX 1366. 
2 
ty oe AF ann acer rn <aone sient ac RR Ct ema 
