. Journal of agricultural research . Journal of Agricultural Research Vol. XVIII, No. 5 PLAJE 24 A.—Longitudinal section of the fertile pistil at the time the silk has started to elon-gate: ovw, ovary wall; sc, stylar canal; ovc, ovule coats; ov, ovule; ms, megasporemother cell; sk, silk. X 300. B.—Longitudinal section of the fertile pistil at the time the ovule has started toinvert: ovw, ovary wall; sc, stylar canal; sk, silk; ovc, ovule coats; ms, megaspore-mother cell. X 300. PLATE 25 A.—Longitudinal section of the inverted ovule: ov, ovule; ovc, ovule coats; es,embryo sac; mic, micropyle;

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. Journal of agricultural research . Journal of Agricultural Research Vol. XVIII, No. 5 PLAJE 24 A.—Longitudinal section of the fertile pistil at the time the silk has started to elon-gate: ovw, ovary wall; sc, stylar canal; ovc, ovule coats; ov, ovule; ms, megasporemother cell; sk, silk. X 300. B.—Longitudinal section of the fertile pistil at the time the ovule has started toinvert: ovw, ovary wall; sc, stylar canal; sk, silk; ovc, ovule coats; ms, megaspore-mother cell. X 300. PLATE 25 A.—Longitudinal section of the inverted ovule: ov, ovule; ovc, ovule coats; es,embryo sac; mic, micropyle; co, cavity of ovary. X 250. B.—Section tlirough the stylar canal, showing its structure shortly before the silkemerges from the husk. The union of the two edges of the carpel will eventually bemore complete near the top than is here shown. X 250. Pistillate Spikeletand Fertilization in Zeamays L. Plate 25.

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagricul, bookyear1913