Nov., 1903.] 
The Development of Corn. 
7 
•6. Guignard, L. Sur les antherozo'ides et la double copulation sexuelle 
chez les vegetaux angiospermes. Comptes rendus. 128 : 869. April 
1899. 
7. . La double fecondation dans le Mais. Journ. d. 
Bot. 15 ; 1-14. No. 2. 1901. 
8. KoERNICKE, Friedr. Vorlaufige Mittheilungeu ueber den Mais. 
Sitzungsbericbte d. niederrheinischen Gesellsch. f. Nat. w. Heil- 
kunde in Bonn. Pp. 63-76. 1872. 
9. Nawaschin, S. Ueber die Befruchtungsforgange bei einigen Dicoty- 
ledoneen. Ber. d. Deut. Bot. Gesellsch. 18 : 224-230. 1900. 
10. . Resultate einer Revision des Befruchtungsvorgangs 
bei Liliuni martagon und Fritillaria tenella. Bui. d. I’Acad. Imp. 
d. Sciences de St. Petersbourg, T. 9, No. 4. 1898. Also Botanisches 
Centralblatt. 77 : 62. 1899. 
11. SCHAFFNER, JOHN H. The Development of the Stamens and Carpels 
of Typha Latifolia. Bot. Gaz. 24 ; 93-102. 1897. 
12. ViEMORiN, Henry L. de. Bui. de la Soc. Bot. de France. 14 : 246. 
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12. Webber, Herbert. Xenia, or the Immediate Effect of Pollen in 
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F.XPLANATION OF PLATES I AND II. 
All figures originally magnified 75 diameters, except figures 8 and 9, which 
are magnified 190 and 30 diameters respectively. Figures were drawn under 
the camera with Bausch & Lomb microscope, and subsequently reduced to 
about Ye diameter. In the figures, S indicates style (silk) ; C, the stylar 
canal ; I, inner glume ; O, outer glume. 
Fig. I. Very young spikelet showing incipient carpel. 
Fig. 2. Spikelet with young carpel, showing first definite appearance of 
style and ovule. 
Fig. 3. Spikelet with style elongated ; ovule showing archesporial cell and 
first appearance of integuments. 
Fig. 4. Spikelet in which the carpel is nearl}- closed, leaving only a small 
pore into the ovulary. 
Fig. 5. Spikelet with ovule containing 8-celled embryosac. 
Fig. 6. Spikelet with ovule after fertilization and the development of 
considerable endosperm, showing decided enlargement of the 
nucellus. 
F'ig. 7. Carpel still further developed, showing great increase in micellar 
tissue with only slight increase of endosperm. 
Fig. 8. Fhidosperm and embryo same as Fig. 7. 
F'ig. 9. Grain with large embryo, showing great development of endo- 
sperm and the remains of the nucellus. 
Fig. 10. Nearly mature grain, showing relation of carpel wall, integuments, 
endosperm and embryo. Endosperm somewhat shrunken. 
Fig. II. Nearly mature grain, showing section of embryo and comparative 
size of endosperm cells. 
