. Evenings at the microscope : or, researches among the minuter organs and forms of animal life. Microscopy; Microscopes; Medical microscopy. 350 EVENINGS AT THE MICEOSCOPE, The disk is meanwhile enlarging its area; and the spines and suckers, gradually lengthening, at length push themselves through the walls of the helmet; the hanging points and crest of which are fast diminishing by a kind of insensible absorption; the ciliary move- ments become less vigorous, and the mouth closes up. But, correspondently, the Urchin is beginning to ac- quire its own independent power of locomotion; for the
. Evenings at the microscope : or, researches among the minuter organs and forms of animal life. Microscopy; Microscopes; Medical microscopy. 350 EVENINGS AT THE MICEOSCOPE, The disk is meanwhile enlarging its area; and the spines and suckers, gradually lengthening, at length push themselves through the walls of the helmet; the hanging points and crest of which are fast diminishing by a kind of insensible absorption; the ciliary move- ments become less vigorous, and the mouth closes up. But, correspondently, the Urchin is beginning to ac- quire its own independent power of locomotion; for the suckers, now ever sprawling about, are capable of adhering to any foreign body with which they come into contact, and of dragging the whole structure about, by their prop- er contractions. The cilia that cover the thickened fring- ing band still exercise their Development of Disk. powers, and are the last to disappear. When the disk has grown to such an extent as to spread over about half of the larval stomach, very little remains of the helmet, except the middle portions of the glassy rods and the ciliary bands ; all the rest of this exquisitely modelled framework having van- ished by insensible degrees, no one knows how or where. The stomach and gullet indeed are gradually sucked into the ever-growing disk; but all the rest, flesh and rods, fringes, bands, and cilia, waste away to nothing. The mouth of the larva has no connexion with the mouth of the TJrchin. The little isolated patches of glassy network continue to spread through the flesh. 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 Gosse, Philip Henry, 1810-1888. New York, D. Appleton
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Keywords: ., bookcentury1800, booksubjectmicroscopes, booksubjectmicroscopy
