File:The microscope and its revelations (1856) (14776099884).jpg

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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emovement of the blood will be distinctly seen by that of thecorpuscles, which course after one another through the net-work of capillaries that intervenes between the smallestarteries and the smallest veins ; in those tubes that pass mostdirectly from the veins to the arteries, the current is alwaysin the same dii-ection; but in those which pass-across betweenthese, it may not unfrequently be seen that the direction ofthe movement changes from time to time. The larger vessels(Pig. 327), with which the capillaries are seen to be connected,are almost always veins, as may be known from the directionof the flow of blood in them from the branches (b, b) towardstheir trunks (a); the arteries, whose ultimate subdivisionsdischarge themselves into the capillary network, are for the 728 VEETEBKATED ANIMALS. most part restricted to the immediate borders of the toes.When a power of 200 or 250 diameters is employed, the visiblearea is of course greatly reduced; but the individual vessels Fig. 327
Text Appearing After Image:
Capillary ciiculation in a portion of the web of a Frogs foot; a, trunk of vein;b, b, its branches; c, c, pigment cells. and their contents are much more plainly seen; and it maythen be observed, that whilst the red corpuscles flow at a veryrapid rate along the centre of each tube, the colourless cor-puscles which are occasionally discernible, move slowly in theclear stream near its margin. 432. The circulation may also be displayed in the tongue ofthe Erog, by laying the animal down on its back, with its headclose to the hole in the cork-plate, and, after securing thebody in this position, drawing-out the tongue with the forceps,and fixing it on the other side of the hole with pins. Thismethod, however, is so much more distressing to the animal, CIRCULATION IN TADPOLE AND FISH. 729 that its employment seems scarcely justifiable for the merepurpose of display; and nothing but some anticipated benefitto science, can justify the laying-open of the body of theliving animal, for the purpo

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