I'M XXII. 



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FIG. 6r.-Vertical section of the pariet*! bone of the sknll of a child, niacemte.! in chromic acid, showing the lx>ne 

 traliecul.-e of the diploe. a. Bone tr.il>ecul.-i-. d.vi-ivd liy (6) osteoblasts. c. Medullary tissue (in ..utline). <i. Space*, 

 artificially occasioned by the yielding of the lamella.' of the lione tialHu-ula.-. p. 5,1. (I,o\v power.) 



