Microscopical characters of the rhythmically contractile muscular coat of the veins of the bat’s wing, of the lymphatic hearts of the frog, and of the caudal heart of the eel. In three parts.—Part I. Microscopical characters of the rhythmically contractile muscular coat of the veins of the web of the bat’s wing

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Abstract
This is Part I., of a series of three, of a paper on the microscopical characters of rhythmically contractile muscular tissue, other than that of the blood-heart. It comprises a reexamination of the microscopical characters of the rhythmically contractile muscular coat of the veins of the bat’s wing, and is offered by the author as Appendix No. 3 to his paper in the Philosophical Transactions for 1852, entitled “Discovery that the veins of the Bat’s Wing (which are furnished with valves) are endowed with rhythmical contractility, and that the onward flow of the blood is accelerated by each contraction.” This reexamination supplies additional details, illustrated by more correct figures, confirmatory of the author’s previous description of the microscopical characters of the muscular coat of the veins of the bat’s wing. The author examines also, by way of comparison, the tonically contractile muscular coat of the arteries, and points out that, though the fibrils of the muscular coat of the veins do not present transverse markings, they differ in their microscopical characters as much from the fibrils of the muscular coat of the arteries, as the transversely striped muscular fibrils of the bat’s heart do from them. He insists, therefore, in conclusion, that there are no grounds for an implied physiological form of the doctrine of isomerism, viz. similarity of structure, with different endowments.

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