. Un texte-livre de physiologie comparative pour les étudiants et les praticiens de la médecine comparative (vétérinaire) . vertical cross - section présente la lamelle? Dont il est composé et les canaux vasculaires coupés(Fig. 445). Tout ceci est, cependant, seulement le cadre de tissu osseux.si un os d'un animal fraîchement tué, sans saignement, beexaminé, un état très différent des choses sera trouvé. Le médullaire est plus lourd; sa surface est recouverte d'une structure fibreuse très adhérente, dure, le périoste : et sa médullarycavité remplie de moelle. Si l'os est brisé, itssection

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. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . vertical cross - section exhibits the lamella? ofwhich it is made up and the vascular channels cut across(Fig. 445). All this is, however, only the framework of osseous tissue.If a bone from an animal freshly killed, without bleeding, beexamined, a very different state of things will be found. Thebone is heavier; its surface is covered with a closely adherent, tough, fibrous structure, the periosteum : and its medullarycavity filled with marrow. If the bone be broken across, itssection looks red, and blood flows from the surface. Investiga-tion proves that the covering periosteum is a bed in whichblood-vessels and nerves ramify, and from which they enter 608 COMPARATIVE PHYSIOLOGY- the openings to be seen on the surface of the dead bone. TheHaversian canals are vascular channels, and the lacunae filledwith bone corpuscles (Fig. 446). The marrow in the extremi-ties of the bone is of a red color in consequence of its great vas-cularity; and in the young animal a similar marrow fills the. Pia. 448.—Section of cartilage of ear of man (Rollett). a, fibre-cartilage; b, connect-ive tissue. The cartilage had been boiled and dried prior to cutting. medullary canal, but later it is less vascular, and abounds infat. Blood-vessels pass from it into the compact tissue of the CERTAIN TISSUES. 609 bone. The main artery, whence the others are derived, for theshaft of the hone, enters by the nutrient foramen on the sur-face, and toward the center. The bone-corpuscles (Fig. 446), answering to the connective-tissue cells, are nutritive and formative after a considerableportion of the tissue has become the seat of the deposit of lime-salts. Bone is a living tissue, though in a less degree thanmost others; but it is only by bearing these relations in mindthat its function in the support of the soft parts of an animal, and especially as constituting the essential levers of its lo

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