428 BOTANICAL GAZETTE [DECEMBER 
LITERATURE CITED 
1. WARMING, E., Recherches et remarques sur les Cycadées. Oversigter 
Vidensk. Selsk. Forh. 1877. 
Trevus, M., Recherches sur les Cycadées. Ann. Jard. Buitenzorg 4: 
1-11. pls. ee 1884. 
KENO, S., Untersuchungen iiber die Entwickelung der Geschlechtsorgane 
und der Viens der Befruchtung bei Cycas revoluta. Jahrb. Wiss. Bot. 
32:557-602. pls. 810. 1808. 
Coutter, J. M., and CHamBertarn, C. J., The embryogeny of Zamia. 
Bot. GAZETTE 35:184-104. pls. 6-8 
. Mrvyakg, K., Ueber die Spermatozoiden von Cycas revoluta. Ber. Deutsch. 
Bot. Gesell. 24:78-83. pl. 6. 1906. 
6. SIstER HELEN ANGELA, The embryo of Ceratozamia, a physiological study. 
Bot. GAZETTE 45:412-416. figs. 7. 1908. 
. THIESSEN, REINHARDT, The vascular cuesaes of the seedling of Dioon 
edule. Bot. GAZETTE 46:357-380. pls. 23-29. 
8. CHAMBERLAIN, CHARLES J., eg eae in seme edule. Bort. GA- 
ZETTE 47:215-236. pls. 15-18. 1 
SAXTON, W. T., The on on of the embryo of Encephalartos. Bot. 
Ginn 49:13-18. pls. 2. 1910. 
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DESCRIPTION OF PLATES XIV-XVII 
Fic. 1.—Upper part of ovule at the time of fertilization; the figure is _ 
reconstructed from several sections; the pollen tube on the left shows the 
_ body cell still undivided; the one in the middle shows two sperms and the 
remains of the stalk and prothallial cells; next to this tube is one in which the 
body cell has just divided, and the prothallial and stalk cells are still turgid; 
two pollen tubes which have discharged their contents are also shown; the 
dark line below the outer part of the nucellus is the megaspore membrane. 
Fic. 2.—Late prophase during the free nuclear division in the proembryo, 
showing the intranuclear membrane (m). 480. 
Fic. 3.—Early telophase during the free nuclear period; the nuclear mem- 
brane has rot yet been formed. X 480. 
Fic. 4.—Telophase during free nuclear period; the central portion of the 
fibers from the evanescent walls. X4 
Fic. 5.—Lower part of pioeiibeyd; showing evanescent but complete 
_ segmentation. 
Fic. 6.—Diagram showing the complete cabins of which fig. 5 shows 
only the lower part. 
Fic. 7.—Lower part of proembryo, showing permanent walls at the base. 
Fic. 8.—Young embryo: d, diaphragm; f, free nuclei; @ 2 and b, cells 
which may contribute to both “rosette” and suspensor. 
