. Electro-physiology. Electrophysiology. xi ELECTRICAL FISHES 399 organ of Raja, with its distinct series of cases. Closer inspection reveals in sections parallel with the surface of the skin, or with the axis of the fish, a delicate lattice-work of fibres, which cross at an acute angle, the intermediate spaces appearing grayish and semi-transparent. After treatment with a hardening reagent (alcohol, chromic acid) these structural relations are seen still more plainly. The lattice-work (" sieve," Bilharz) is then found to correspond with the cross-sections of innumerable fine mem- br
. Electro-physiology. Electrophysiology. xi ELECTRICAL FISHES 399 organ of Raja, with its distinct series of cases. Closer inspection reveals in sections parallel with the surface of the skin, or with the axis of the fish, a delicate lattice-work of fibres, which cross at an acute angle, the intermediate spaces appearing grayish and semi-transparent. After treatment with a hardening reagent (alcohol, chromic acid) these structural relations are seen still more plainly. The lattice-work (" sieve," Bilharz) is then found to correspond with the cross-sections of innumerable fine mem- branes of connective tissue, which run vertical to the axis of the • '-. • \ - '^L LJ " C - FIG. 259.— Portion of through epidermis of Main pic i -itnis. (Fritsch.). fish, separated by small intermediate spaces. These pass externally into the mass of fibres of the corium, while they unite internally into the so-called tendinous integument. In this way the organ is composed of innumerable partition-walls, running parallel with each other, but at right angles, collectively, to the axis of the fish, and divided into a number of small, hollow spaces, of approxi- mately the same size, with no internal communication (Fig. 260). The axes of these compartments, which are mostly lens-shaped, or double pyramidal, all lie parallel with the axis of the fish. Their equatorial planes are thus vertical to the same, so that the one wall is turned to the head-, the other to the tail-end. Within. 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 Biedermann, W. (Wilhelm), 1852-1929; Welby, Frances A. (Frances Alice). London : Macmillan
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Keywords: ., bo, bookcentury1800, bookdecade1890, bookpublisherlondonmacmillan
