INTRODUCTION 



structure of bone is fibrous, and along with the fibers are 

 cells called bone corpuscles, while the cementing material 

 is earthy matter. In many situa- 

 tions, parts which are in early life 

 composed of cartilage become after- 

 ward replaced by bone, through the 

 process called ossification. 



20. Blood is a fluid connective tis- 

 sue which conveys nutriment to all 

 parts of the body (Fig. 17). It 

 holds suspended in its liquid por- 

 tion, or plasma, large numbers of 

 cells called corpuscles. These are 

 of two sorts, named from their color the red or colored 

 corpuscles, and the white or colorless corpuscles. The 

 latter have one or more nuclei, while the red corpuscles 

 have none. 



Fig. 17. Human blood 

 corpuscles. 



R red. W white. 



