Identifier: microscopeitsrev1856carp (find matches)
Title: The microscope and its revelations
Year: 1856 (1850s)
Authors: Carpenter, William Benjamin, 1813-1885
Subjects: Microscopy Microscopes Microscopy
Publisher: London : John Churchill
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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um, both between itscellulose coat and its primordial utricle, and within thelatter; and the ciliary action by which, according to thetestimony of some good observers, this circulation is main-tained. It is not difficult to distinguish this movement alongthe convex and concave edges of the cell of any vigorousspecimen of Closterium, if it be examined under a magnifyingpower of 250 or 300 diameters; and a peculiar whirhngmovement may also be distinguished, in the large roundedspace which is left at each end of the cell by the retreat ofthe endochrome from the primordial utricle (Pig. 72, a, b).According to Mr. S, G. Osborne, however, by using the Pauley moderator (§ 1^) with dnect sun-light and anachromatic condenser, and by increasing the power to about 288 MICROSCOPIC rOEMS OP \TEGETABLE LIPE. 500 diameters (Mr. Eosss objective of 1-Gtli in., with a dee^Deye-piece, being the combination employed), a very distinctaction of cilia may be discerned, both along the inner edge of Fig. 72.
Text Appearing After Image:
Economy of Closterium lunula:—k, frond showing central separa-tion at a, in which large glohules, h, are not seen;—b, one extremityenlarged, showing at a the double row of cilia, at b the internal cur-rent, and at c the external current;—c, external jet produced bypressure on the frond;—d, frond in a state of self-division. the primordial utricle, between this membrane and the endo-chrome, and along its outer edge, beneath the cellulose coat;the action being in opposite directions in these two situations,and producing two opposite currents. By careful focussing,the circulation may be seen in broad streams over the wholesurface of the endochrome; and these streams detach andcarry with them, from time to time, little oval or globularbodies (a, b), which are put-forth from it, and which arecarried by the course of the flow to the chambers at theextremities, where they join a crowd of similar bodies (b).In each of these chambers, a current may be seen from thesomewhat abrupt termi

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