# * * «^ 



N 





Fig. lU. Giant cell on implanted bone reacted for acid phosphatase and 

 counterstained with hematoxylin. Activity was confined to the cytoplasm of 

 the cell (C), while the mass of nuclei (N) stained with hematoxylin. (X 350.) 



Fig. 11. Labial alveolar bone of a 3-day-old rat, taken from about the 

 upper incisor tooth, reacted for acid phosphatase and counterstained with 

 hematoxylin. Note activity in the osteoclasts (arrows) resorbing the bone (B). 

 (X350.) 



525 



