Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 D FIG. 32.—Section through. *he root of a tooth (after Kolliker). C, cement; J, interglobular spaces D, dentine with deutinal tubes. of bones ; and a primary was distinguished from a second- ary method of bone develop- ment. In reality the two Fl°' 33'~A Section °f ossifrille cartilage (after Frey). a, Smaller marrow spaces placed in the processes resemble each other cartilage; b, ditto, with cells of the cartilage closelv For in the latter marrow; «
Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 D FIG. 32.—Section through. *he root of a tooth (after Kolliker). C, cement; J, interglobular spaces D, dentine with deutinal tubes. of bones ; and a primary was distinguished from a second- ary method of bone develop- ment. In reality the two Fl°' 33'~A Section °f ossifrille cartilage (after Frey). a, Smaller marrow spaces placed in the processes resemble each other cartilage; b, ditto, with cells of the cartilage closelv For in the latter marrow; «, remains of the calcified cartilage; d, larger marrow spaces; e, osteoblasts. case, in conjunction with a precedent deposition of lime, and partial destruction or reduction of the cartilage, there is a new formation of a soft connective tissue-substance (osteogenic substance) from the centre outwards, thr cells (osteoblasts) of which give rise to bone corpuscles and the intermediate tissue becomes the hard basis of bone (fig. 33). More- over, cartilage bones grow in thickness at the expense of the
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