. Johnson's new universal cyclopaedia : a scientific and popular treasury of useful knowledge. like eurtiluge, consists of cells imbedded in amatrix. In thin seetifins of y redectcd liglit the finmcr appear\?hito and opaque, the latter transUiceut. These appear-ances depend upon the tact that in dried bono the lacunarand ennallculi are hollow and contain air, as may be de-monstrated by first tlowing turpentine upun a thin sectionwhile under microscopical observation, antl tlien permittingit to dry. In recent bone, and especially in growing bune,the are tilled with a mass of jinitoplasm
. Johnson's new universal cyclopaedia : a scientific and popular treasury of useful knowledge. like eurtiluge, consists of cells imbedded in amatrix. In thin seetifins of y redectcd liglit the finmcr appear\?hito and opaque, the latter transUiceut. These appear-ances depend upon the tact that in dried bono the lacunarand ennallculi are hollow and contain air, as may be de-monstrated by first tlowing turpentine upun a thin sectionwhile under microscopical observation, antl tlien permittingit to dry. In recent bone, and especially in growing bune,the are tilled with a mass of jinitoplasm containinga nucleus, which sends processes into the canaliculi. XUe&e. Bone (loni^itiiiliuul». masses of protoplasm are the proper bone-cells. Osseoustissue is very vascular, and the capillaries lie in the com-pact substance of the long bones in a series of longitudinalanastomosing channels—the canals of Havers—which arecontinuous with the larger canals containing the nutritivearteries, with the areolar spaces of the spongy extremitiesof the bones, and with the marrow cavities. In transversesections of the compact shafts of tlie long bones, thcreibre,the canals of Havers appear as rounded or oval openings,disposed at tolerably regular intervals, with the lacuna; ar-ranged regularly around them in coaccntrio rows. In lon-FiG. 4.
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Keywords: ., bookcentury1800, bookdecade1880, bookidjohnsonsnewu, bookyear1881
