. The plant, an illustration of the organic life of the animal. Biology. GENERAL CONSIDERATIONS. 127 reproduction, also lay eggs. The former are only additional means employed by nature to secure the perpetuation of the species, super-added to the usual method of propagation. Now plants have sexes or sexual organs as well,as ani- mals. The female sexual organs in plants are called Fig. 24. Fig. Fig. 21. A pistil exhibited in section to show the young ovules d, attached to the placenta or walls of the ovary cs, and contained within its cavity, c. The stigma or summit of the pistil, to whic
. The plant, an illustration of the organic life of the animal. Biology. GENERAL CONSIDERATIONS. 127 reproduction, also lay eggs. The former are only additional means employed by nature to secure the perpetuation of the species, super-added to the usual method of propagation. Now plants have sexes or sexual organs as well,as ani- mals. The female sexual organs in plants are called Fig. 24. Fig. Fig. 21. A pistil exhibited in section to show the young ovules d, attached to the placenta or walls of the ovary cs, and contained within its cavity, c. The stigma or summit of the pistil, to which the pollen grains adhere when fertiliza- tion takes place. &. The style of the pistil, through the loose cellular tissue of which the pollen tuhes descend in their passage to the ovary.' Fig. 25. A stamen. Its filament or support a, and its anther d, discharging the fecundating matter or pollen. carpels. The pistil which consists of stigma, style, and ger- men, is only a fully developed cai^el. The male sexual organs are named stamens, the anthers of which contain the pollen or fecundating matter. The stamens and car- pels are the essential organs of reproduction in plants, since it is by the mutual action of these bodies that the vegetable embryo is formed. The ovules contained in the germen or ovary are the bodies which after impregnation become seed. Their exis- tence may be verified by making a section of the germen, whilst the flower is still in the bud, and before the anther cells have been ruptured,- and, in this condition, they un-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Coultas, Harland, d. 1877. Philadelphia ; Perry and Erety
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