BONE. 



47 



Connective 

 tissue. 







Marrow 



space. 



Blood- ves- 

 sel. 



Osteobla 







Osteoblasts. 



FIG. 37. From a cross-section of a shaft (tibia of a sheep) ; X 550 (Bohm and 

 Davidoff) : in the lower part of the figure is endochondral bone-formation (the 

 black cords are the remains of the cartilaginous matrix) ; in the upper portion is 

 bone developed from the periosteum. 



of ossification become larger and arranged in rows ; in the 

 matrix or ground-substance, between these rows of cells, lime 

 salts are deposited in such manner as to form longitudinal rows 

 of cells, separated by the calcified matrix ; in the matrix, between 



