. La cyclopaedia d'anatomie et physiologie. Anatomie ; physiologie ; Zoologie. 848 tissus osseux. Fig. 448. • »•, '--•. La section transversale de la partie dense du fémur. a, b ; canal Haversien, lamines concentriques ; c, les couches de connexion ; d, globules, avec leur système de tubes. Les pièces marquées a, b et d constituent un système haversien. Le chiffre inclut trois systèmes avec les couches de la liaison qui les unit. gistrement, il sera trouvé pour ne contiennent pas de canaux ou Haversien globules, mais d'être extrêmement mince et transparent. Un tel passage, lorsque vu avec l'un huitième de pouce o

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. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 848 OSSEOUS TISSUE. Fig. 448. • '"•, --•. Transverse section from the dense portion of the femur. a, Haversian canal ; b, concentric laminae ; c, laminae of connection ; d, corpuscles, with their system of tubes. The parts marked a, b, and d constitute an Haversian system. The figure includes three systems with laminae of connection uniting them. lected, it will be found to contain no Haversian canals or corpuscles, but to be extremely thin and transparent. Such a portion, when viewed with the one-eighth of an inch object-glass of Mr. Powell's microscope, will present a deli- cate granular aspect with the surface nodulated. This granular appearance arises from the sub- stance of the bone being composed of minute irregularly spherical granules. It is not diffi- cult to trace this structure in any specimen of bone, though in some it is much more distinct than in others. Specimens put up in Canada balsam do not show the minute structure very well. It is best to place the object between two slips of glass with a little plain water. A delicate spicula from the point where os- sification is going on is usually very good for illustrating the granular tissue. But the granules may be obtained separated from each other, so that each individual may be examined apart from its fellows. When so exposed to view, they exhibit a tolerably re- gular character, being mostly spherical, some few having an oval form. In some specimens the oval predominates over the spherical con- formations. Often a few will be found which are egg-shaped, with the smaller end elongated, (see fig. 449, ) though to no great extent. The osseous granules may be gained by subjecting bone to high-pressure steam, or to a red heat, till all the animal matter is removed. In either instance the granules may be obtained by taking !. 449.. Please note that these images are extracted from scanned page images that may have been digital

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