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, Frtedr. Vorlanfige Mittheilungen ueber den Mais. 



Sitzungsberichte d. niederrheinischen Gesellsch. f. Nat. w, Heil- 

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9. Nawaschin, S. Ueber die Befruclitungsforgange bei einigen Dicoty- 



ledoneen. Ber. d. Deut. Bot. Gesellsch. 18 : 224-230. 1900. 



10. . Resultate einer Revision des Befruchtungsvorgangs 



bei Lilium martagon und Fritillaria tenella. Bui. d. I'Acad. Imp. 

 d. Sciences de Str Petersbourg, T. 9, No. 4. 189S. 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. ViLMORiN, Henry L. de. Bui. de la Soc. Bot. de France. 14 : 246. 



Seance du 29 Nov. 1S67. 

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KXPLANATION 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 Ve 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. 



Spikelet with young carpel, showing first definite appearance of 



st5de and ovule. 

 Spikelet with style elongated ; ovule showing archesporial cell and 



first appearance of integuments. 

 Spikelet m which the carpel is nearly closed, leaving only a small 



pore into the ovulary. 

 Spikelet with ovule containing S-celled embryosac. 

 Spikelet with ovule after fertilization and the development of 

 considerable endosperm, showing decided enlargement of the 

 nucellus. 

 Carpel still further developed, showing great increase in nucellar 



tissue with only slight increase of endosperm. 

 Endosperm and embryo same as Fig. 7. 



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. 



Fig. 2 

 Fig. 3 



