. A manual of botany. Botany. 278 MANUAL OF BOTANY generally peripheiical, become also approximated, and it is said to be amphitropous. When we wisli to know the direction of the embryo, it is at once determined by ascertaining the position of the hiluin, chalaza, and mieropyle. We have now lastly to explain the diflerent terms which are in use to express the relations which the embryo bears to the cavity or cell in which it is placed. The radicle is said to be Fig. 606. Fig. Fig. 608. Fig. G05. VerticEil section of the fruit of the Nettle, contaiuiug a single seed. t. Internments of th
. A manual of botany. Botany. 278 MANUAL OF BOTANY generally peripheiical, become also approximated, and it is said to be amphitropous. When we wisli to know the direction of the embryo, it is at once determined by ascertaining the position of the hiluin, chalaza, and mieropyle. We have now lastly to explain the diflerent terms which are in use to express the relations which the embryo bears to the cavity or cell in which it is placed. The radicle is said to be Fig. 606. Fig. Fig. 608. Fig. G05. VerticEil section of the fruit of the Nettle, contaiuiug a single seed. t. Internments of the seed. pi. Placenta. i\ Radicle, st. Stigma. Fill. 606. Vertical section of the fruit and solitary erect orthotropous seed of the Dock (). ov. Pericarp, mic. Mieropyle. pi. Emhryo which is inverted or antitropous, and turned towards one side of the albu- men, alb. ch. Chalaza. r. Radicle. Fig. 607. Vertical section of the carpel of Mirahilis Jalapa, containing one seed. a. Pericarp, s. Style. e. Peripherical embryo with its radicle, i\ and cotyledons, c. p. Albu- men, t. Integuments of the seed. Fitj. 608. Vertical section of the seed i)f Ltichvt^ dioica. te. Integuments, emh. Embryo on the outside of the albumen, olh. The etnbryo is amphitropous and peripherical. superior or ascending, as in the Nettle (fig. 605, r) and Buinex (fig. 606, r), when it is directed towards the apex of the cell or pericarp ; inferior or descending when it points to the base ; centripetal if turned inwards towards the axis or centre; and centrifugal when it is turned towards the sides. These rela- tions of the embryo to the other parts of the seed and to the cavity or cell in which it is placed, are sometimes of much prac- tical 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 Green, J. Reynolds (Joseph Reynold
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