A STUDY OF LIVING SUBSTANCE 



car'-ti-lage or gristle. Placing a thin section of this cartilage 



beneath the micro- 

 scope, we can dis- .-:,>. } n 



tinguish cells looking 



somewhat like blood 



corpuscles. The nu- 

 cleus and body of each 



cell become visible 



when the tissue is 



stained ; but instead 



of floating in a liquid, 



as did the red corpus- 

 cles of the blood, these 



cells are imbedded in 



solid cartilage. The 



term in'ter-cel'lu-lar 



substance (Latin, in'ter 



= between + cel'lu-la = cell) is applied to this tough gristle 



which is a product of the cartilage cells. 



Another kind of intercellular substance is found in bone 



tissue. If a thin 

 section 

 bone is 



;> 



FIG. 7. Thin Section of Cartilage, highly 

 magnified. 



a = group of two cartilage cells. 

 b = group of four cartilage cells, 

 c = cell body of cartilage cell. 

 m = intercellular substance (cartilage). 

 n = cell nucleus of cartilage cell. 



with 

 scope, 



a 



of dried 

 examined 

 the micro- 

 tiny spaces 



are seen, which, 

 when the bone was 

 alive, were filled 

 with the proto- 

 plasm of cells. 

 These bone cells 

 are usually more 

 or less oval in out- 

 line, but the proto- 

 plasm of each cell body extends outward in many fine irregu- 

 lar processes that approach closely to the processes from 



FIG. 8. Thin Section of Bone, magnified 110 



times. 

 Photographed through the microscope. Black 



irregular spots are filled with the bone cells. 



White spaces between are formed by bony 



intercellular substance. 



