Outlines of Structural and Physiological Botany

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J. Van Voorst, 1847 - Botany - 245 pages
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Page 19 - Charaeeae, and have more recently been discorered in peculiar cells on the germinal frond of ferns, and on the very young leaves of the buds of Phanerogamia. They are found in peculiar cells, and when these are placed in water they are torn by the filament, which commences an active spiral motion. The signification of these organs is at present quite unknown ; they appear, from the researches of Nageli, to resemble the cell mucilage, or proto-plasma, in composition, and are developed from it. Schleiden...
Page 112 - Idiothalamea; : shields closed at first, opening afterwards, containing free spores in a nucleus composed of the gelatinous remains of the paraphytes and sporangia. Sub-order 3. Gasterothalamece : shields either closed always, or opening by bursting through the cortical layer of the thallus, the nucleus containing the deliquescing or shrivelled sporangia. Sub-order 4.
Page 103 - ... they expected something of the extravagance of youth in her proceedings. It now seems more probable that the Coleopterous fauna there was the same in type then as now, and that it has continued so in the region I speak of for all the intervening period, in accordance with the rule already referred to, that the lower we descend in the scale of organization, the more persistent is the general character of the forms of which life is composed. It is not a reply to say that the Eocene flora, which...
Page 23 - P. 27. It may be our own fault, but we must confess we do not understand the following definition of one kind of our author's porous cells. " B. Cells with bordered pores, arising from the presence of a lenticular cantr between two adjacent pores.
Page 118 - ... from the tissue of the leaves, either on the surface or in the angles of the lobes ; these drop off and become independent plants. Although among the Phanerogamia the buds more frequently remain in continuity with the parent structure, yet there are not wanting examples of their spontaneous separation. This is the case, for instance, with the common Lilium bulbiferum and with the Dentaria...
Page 223 - ... appearance. The predominating colours are yellow, red and blue, with the various intermediate tints; sometimes these colours are converted one into another in the petal after fertilization (at which period the colours are brightest).
Page 89 - ... Lindley's Introduction to Botany. Again, a tuber and a tuberous root are essentially different in their nature, yet Mr. Henfrey speaks of them as one and the same thing. " These enlargements are called tubers, and the roots are said to be tuberous." P. 65. At page 93, however, it is remarked — " There is occasionally some difficulty in determining the point, as in such subterraneous branches as those which form the tubers of the potatoe. The expansion of this branch here closely resembles the...
Page 75 - P. 79. At page 73 we meet with the term median nerve. This, to the student of medicine, is utterly destructive of the help otherwise derivable from bestowing the same name only on an organ or structure in one kingdom of nature which is like to, or performs the same offices as the...
Page 72 - PHYLLODE.—In some forms of petiole the bundles, instead of remaining united until they reach the lamina, separate and become connected only by a flat expansion of cellular tissue like that belonging to the blade of the leaf.

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