. Physiological botany; I. Outlines of the histology of phænogamous plants. II. Vegetable physiology. Plant physiology; Plant anatomy. DIKECTION OF 381 According to him, the planes of the walls at a point of growth maj- be thus classified : ^ —. 1 "The relations of the periclinal and anticlinal planes are illustrated by the following cases : — (a) If the outline (in longitudinal section) of the growing point is a parab ola, the periclinals will constitute a system of confocal parabolas of different paranreter, the focns of the system being at the point of intersection of t
. Physiological botany; I. Outlines of the histology of phænogamous plants. II. Vegetable physiology. Plant physiology; Plant anatomy. DIKECTION OF 381 According to him, the planes of the walls at a point of growth maj- be thus classified : ^ —. 1 "The relations of the periclinal and anticlinal planes are illustrated by the following cases : — (a) If the outline (in longitudinal section) of the growing point is a parab ola, the periclinals will constitute a system of confocal parabolas of different paranreter, the focns of the system being at the point of intersection of two lines, of which one is the direction of the axis and the other of the parameter. In this case the anticlinals, being the orthogonal trajectories of the periclinals, constitute a system of confocal parabolas, the axis and focus of which coincide with those of the periclinals. (b) If the outline of the growing point is a hyperbola, the periclinals will be confocal hyperbolas, with the same axis hut different parameter; the anti- clinals will be confocal ellipses, with the same focus and axis as the periclinals. (c) If the outline of the growing point is an ellipse, the periclinals will be confocal ellipses ; the anticlinals will be confocal hyperbolas" (Abstract from Fig. IGT. Tradescantia Virginica. Process of cell-division in the stamen-hairs, a, with a quiescent nucleus in the lower cell, and in the upper, one which has just fin- ished its division; 6, nucleus showing a coarse granular structure with a tendency to linear arrangement of the particles. The drawings from c to h inclusive exhibit the dilferent stages of cell-division at the following points of time: c, at 10 o'clock and 10 minutes; rf, 1020; e, ; /, ; g, ; 7t, ; i, ; i, ; h, (Strasburger.). 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
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectplantanatomy, bookyea
