. An elementary course of practical zoology. Zoology. li6 THE 'FROG CHAP. from one another and intercellular-substance is formed between them. In the embryo, this tissue consists entirely of closely packed cells which gradually separate and form a structureless matrix which is firm and elastic, and which in some parts (pp. 46 and 48) may become calcified. Bone.—As we have already seen (p. 52) bone is formed of two constituents, a basis of animal matter in which mineral matter—calcium phosphate and carbonate—is deposited. In microscopic examination we may therefore mvestigate. Fig. 35.—Transver
. An elementary course of practical zoology. Zoology. li6 THE 'FROG CHAP. from one another and intercellular-substance is formed between them. In the embryo, this tissue consists entirely of closely packed cells which gradually separate and form a structureless matrix which is firm and elastic, and which in some parts (pp. 46 and 48) may become calcified. Bone.—As we have already seen (p. 52) bone is formed of two constituents, a basis of animal matter in which mineral matter—calcium phosphate and carbonate—is deposited. In microscopic examination we may therefore mvestigate. Fig. 35.—Transverse section of dry femur of frog. canaliculi; Ic. lacuna ; Im. lamellae ; m. marrow cavity. either the mineral matter by examining dried bone, or the animal matter by examining decalcified bone. A thin section of a dried long bone, such as the femur, shows that it is formed of very numerous thin layers or lamella (Fig. 35, Irn), surrounding and concentric with the marro* cavity. The lamellae contain numerous cavities, the lacuna {Ic), with delicate, branching tubes, the canaliculi. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Parker, William Newton, joint author. London, Macmillan and Co. , Limited; New York, The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1900
