. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. VEIN. 1377 and semi-pellucid. It appears structureless to the naked eve, and looks almost like a thin film of fecula jelly (arrow-root made with water), or rather, perhaps, like the flaccid dull cornea of an animal dead some days. When separated, it coils up, and, where the surfaces have become adherent, it is difficult to unfold it again : it novv looks and feels like thick mucus — it is semitrarisparent and adhesive. When seen under the microscope, it is found to be indis- tinctly fibrous ; some masses appear as a dens
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. VEIN. 1377 and semi-pellucid. It appears structureless to the naked eve, and looks almost like a thin film of fecula jelly (arrow-root made with water), or rather, perhaps, like the flaccid dull cornea of an animal dead some days. When separated, it coils up, and, where the surfaces have become adherent, it is difficult to unfold it again : it novv looks and feels like thick mucus — it is semitrarisparent and adhesive. When seen under the microscope, it is found to be indis- tinctly fibrous ; some masses appear as a dense web of flat fibres, the fibres being strictly on the same plane, with their sides adherent at some points, and leaving intervals at others ; in some places the interspaces are only small specks on the surface of what appears to be in other respects, an almost homogeneous sheet; there are also some indistinct longi- tudinal striations, connecting these minute interspaces and obscurely indicating the out- line of fibres. The element of which this coat is composed is singularly pellucid under the microscope, scarcely refracting excepting at its edges. The fibrous mass of which the vein is com- posed, in many places exhibits the appearance as if the fibres were formed of spindle-shaped cells strung together, with their ends over- lapping; and these cells may be occasionally isolated, — they are spindle-shaped and have an oval nucleus. They resemble those ob- tained from the middle coat of the aorta of a foetal pig, by Lehmann. (See his figure.) Whether this condition is the result of im- perfect maturation of the tissue of which the vein is composed, or otherwise, I am unable to say. V. Valves. — The valves are membranous folds on the inner surface of the veins, having a definite form and regular arrangement with regard to their object — the progress of the venous blood to the heart, and obstruction to its regurgitation. They are of peculiar interest to the physiologist,
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