44 



EXPERIMENTAL PHYSIOLOGY 



this tissue is supporting, the cells or the matrix? Draw a 

 section, under. the high power, and label all parts. 



C. Bone. Note the ma- 

 trix of spongy bone arranged 

 in concentric rings (lamellae) 

 around the central canals 

 (Haversian canals). Be- 

 tween the lamellae note the 

 -/L cap irregular cavities (lacunce) 

 . v '|fc ;t; _ m with their wavy branches or 



canaliculi. Note how these 

 canaliculi connect the la- 

 cunse with one another and 



J?IG. 17. Hyaline Cartilage: cap, capsule; 



m, matrix formed by cells; c, cartilage with the Haversian Canals. 



Look in the lacuna for the 



bone cells. (In ground sections of bone these will prob- 

 ably be wanting. They appear better in sections of de- 



FIG. 18. Bone: a, canaliculi; 6, Haversian canal; c, lacuna. 



calcified bone.) Draw, under high power, a section loca- 

 ting all the above named parts. 



