A Course of Practical Instruction in Botany
A Course of Practical Instruction in Botany
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G. Saxifraga crustata) in which the structure of the marginal gland is extremely well seen, while the accretions of chalk deposited by the evaporating water are easily recognized with the naked eye. S. Oppositifolia or S. Unibrosa (London Pride) will afford excellent material for the study of these glands. Compare also various Crassulacece.
Treat some of the accretions with acetic acid, and note their solution with evolution of bubbles of C0 2 .
IV. Extra-floral nectaries, Examine the back of t...he leaf of the Cherry Laurel, and near the base of the lamina, on either side of the midrib, will be seen circular areas, of variable number, and with a smooth surface and opaque appearance : these are glands, which produce a sugary secretion.
Cut transverse sections so as to traverse one or more of the glands : mount some in glycerine, others in chlor-zinc-iodine : observe the transition from the ordinary epidermis of the lower surface with the thick outer wall, to the glandular epithelium consisting of cells which are narrow and deep, with plentiful granular protoplasm and nucleus ; the lateral walls are thin ; the external wall is rather thicker and covered by a continuous cuticle (as shown on treatment with chlor-zinc-iodine), which may however be separated from the wall as a thin film, and be rup- tured.
What to read after A Course of Practical Instruction in Botany?
You can find similar books in the "Read Also" column, or choose other free books by F O Frederick Orpen Bower to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
G. Saxifraga crustata) in which the structure of the marginal gland is extremely well seen, while the accretions of chalk deposited by the evaporating water are easily recognized with the naked eye. S. Oppositifolia or S. Unibrosa (London Pride) will afford excellent material for the study of these glands. Compare also various Crassulacece.
Treat some of the accretions with acetic acid, and note their solution with evolution of bubbles of C0 2 .
IV. Extra-floral nectaries, Examine the back of t...he leaf of the Cherry Laurel, and near the base of the lamina, on either side of the midrib, will be seen circular areas, of variable number, and with a smooth surface and opaque appearance : these are glands, which produce a sugary secretion.
Cut transverse sections so as to traverse one or more of the glands : mount some in glycerine, others in chlor-zinc-iodine : observe the transition from the ordinary epidermis of the lower surface with the thick outer wall, to the glandular epithelium consisting of cells which are narrow and deep, with plentiful granular protoplasm and nucleus ; the lateral walls are thin ; the external wall is rather thicker and covered by a continuous cuticle (as shown on treatment with chlor-zinc-iodine), which may however be separated from the wall as a thin film, and be rup- tured.
What to read after A Course of Practical Instruction in Botany?
You can find similar books in the "Read Also" column, or choose other free books by F O Frederick Orpen Bower to read onlineMoreLess
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