SUBPERIOSTEAL BONE. 



99 



new bone-tissue, the osteoblasts becoming enclosed within the homogeneous matrix 

 to constitute the bone-cells. The osseous trabecula thus begins to increase not only 



Fig. 130. 



Epiphyseal bone 



Remains of carti- 

 lage separating 

 bone of epiphysis 

 and diaphysis 



Diaphyseal bone 



Marrow-tissue 



,c;^-:> 



Longitudinal section including epiphysis and upper end of diaphysis of long bone of cat, just before osseous union 



of the head and shaft takes place. X 50. 



in length, by the addition of the last-formed matrix upon the supporting fibres, but 

 also in width, by the deposition of new layers of osseous material by the osteoblasts. 



