. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 508 MUSCLE. The most deeply coloured muscle I have seen was the great pectoral muscle of the Teal (Querquedula ciecca), killed after migration. In Mammalia the colour is ordinarily red, being deeper in theCarnivora than in the vege- table feeders. Among the domestic animals many varieties exist, which need not be spe- cially enumerated. A considerable part of the colouring matter is extracted by repeated wash- ing of a muscle, which then becomes pale, but not quite colourless; some part of the loss of colour here sustain
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 508 MUSCLE. The most deeply coloured muscle I have seen was the great pectoral muscle of the Teal (Querquedula ciecca), killed after migration. In Mammalia the colour is ordinarily red, being deeper in theCarnivora than in the vege- table feeders. Among the domestic animals many varieties exist, which need not be spe- cially enumerated. A considerable part of the colouring matter is extracted by repeated wash- ing of a muscle, which then becomes pale, but not quite colourless; some part of the loss of colour here sustained is doubtless owing to the solution of the haematosine of the blood con- tained in it. A muscle, if hypertrophied, grows redder, and vice versa; and probably the practice of bleeding calves some days before they are killed, makes their flesh more pale and tender, by causing the absorption of a portion of the proper colouring matter of the fibres, as well as by abstracting the blood circulating among them. 5. Internal structure.—Though the elemen- tary fibres of all animals are visible to the naked eye, and in some animals, as the Skate (Itaia Batus), are often as thick as a small pin, nothing of their internal organization can be distinguished without the aid of a powerful lens. There is indeed, in certain lights, a splendid pearly iridescence, resulting from the arrangement of their structure, and quite characteristic among the soft tissues; but this is not explained till a high power of the micro- scope is brought to bear upon the fibres. They are then seen, when viewed on the side, to be marked by innumerable alternate light and dark lines, whose delicacy and regularity nothing can surpass, and which take a parallel direction across them; and if the focus be altered so as to penetrate the fibre, they are found to be pre- sent within it just as on its surface, thus differ- ing from those on the tracheae of insects, which exist only at the surface. At the extreme border o
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