. The comparative anatomy of the domesticated animals. Veterinary anatomy. medullary canal; while a certain number terminate in the areolas of the spongy substance. The walls-of these canals are constituted by several concentric lamellas of fundamental substance, and in ^'-- ''â the body of these are lodged the essential elements of the bony tissue, or osteoplasts (corpuscles or lacunae). These are minute cavi- ties lined by a cellular membrane, and furnished, at their circum- ference, with a great number of canaliculated prolongations, which communicate with the adjacent osteoplasts,'or with
. The comparative anatomy of the domesticated animals. Veterinary anatomy. medullary canal; while a certain number terminate in the areolas of the spongy substance. The walls-of these canals are constituted by several concentric lamellas of fundamental substance, and in ^'-- ''â the body of these are lodged the essential elements of the bony tissue, or osteoplasts (corpuscles or lacunae). These are minute cavi- ties lined by a cellular membrane, and furnished, at their circum- ference, with a great number of canaliculated prolongations, which communicate with the adjacent osteoplasts,'or with the Haversian canals. In a thin dried section of bone, the osteoplasts appear black by transmitted light, and white and brilliant by direct light; this appearance has led some ob- servers to suppose that they were formed of small masses of calca- reous matter. It is now well known that they are minute ramifying cavities, lodging a cell iQterveniQg lamella:, andbeTween impregnated with liquid. very long In the spongy texture no Haversian canals can be seen, the osteoplasts are irregularly disposed in the thickness of the fundamental substance, which con- stitutes the septa of the areolas of this tissue. As a rule, the proper tissue of the bones is composed of a frame- work of organic matter which has gelatine for its base, and in which are deposited the calcareous phos- phates and carbonates, which give to this tissue its characteristic hardness. This is easily rendered evident by immersing any bone in dilute nitric or hydrochloric acid ; acids dissolve the calcareous salts, but do not act upon the organic framework. So it is that, after some days' maceration, the bone becomes flexible, like cartilage, and loses part of its weight, although it preserves its volume. The counterpart of this experiment may be made by submitting it to the action of fire. It IS then rendered quite friable, because its organic skeleton has been destroyed without the earthy salts it contained being af
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