. Elementary botany : theoretical and practical. A text-book designed primarily for students of science classes connected with the science and art department of the committee of council on education . Botany. Formation of Embryo 127 and 245). The first change that takes place (after the sur- rounding of the embryonic vesicle by a cellulose coat) is the division of the vesicle into two (fig. 244, 11., k); the upper cell being developed into a suspending cord, the suspensor or pro-embryo (fig. 246, et), at the end of which the embryo or young plant, formed by the division of the lower cell, is a
. Elementary botany : theoretical and practical. A text-book designed primarily for students of science classes connected with the science and art department of the committee of council on education . Botany. Formation of Embryo 127 and 245). The first change that takes place (after the sur- rounding of the embryonic vesicle by a cellulose coat) is the division of the vesicle into two (fig. 244, 11., k); the upper cell being developed into a suspending cord, the suspensor or pro-embryo (fig. 246, et), at the end of which the embryo or young plant, formed by the division of the lower cell, is attached (fig. 246, e). At the same time a number of cells are produced within the embryo-sac by free cell formation; these are filled with nutritive materials, and are known as endosperm. Sometimes nutritive cells are produced within the I. et-J=- Fig. 245.—Fertilisation of Cfl««a. I. Apex FiG. 246. — Formation of the embryoDf of the embryo-sac, e, at the time when Heliotropium : ed^ endosperm ; ei, sus- the poHen-tube, ps, has just come into pensor; e, rudiment of the embryo, its contact with the embryonic vesicle, k. enveloping membrane being already II. Fertilised embryonic vesicle sepa- formed; a, cells developed out of the rated. two embryonic vesicles. nucleus outside the embryo-sac. In this case the term perisperm is employed. Very often as the embryo increases in size the nutritive cells around are absorbed, until, as we have seen is the case with the Broad Bean, the young plant occupies the whole of the nucieus. In other cases a part of the eridosperm,. 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 Edmonds, Henry. London and New York : Longmans, Green, and Co.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1888
