24 



HITCHCOCK'S 



A NATOM Y 



surface. This is tlie fibro-cellular membrane or tissue. Its 

 position and character will be better understood when the parts 

 above referred to have been described in subsequent sections. 



Fig. IT. Fig. 18. 



3. Cellular Tissues. 



71. Fat and Cartilage.— These embrace the adipose tis- 

 sues, Fig. 17, and the cartilaginous, Fig. 18. The first is the 

 usual form of fat, wherever it occurs in the system. It retains 

 the pure form of the primitive cells. In cartilage, also ; these 

 cells sometimes exist alone, but more frequently they are inter- 

 woven with fibers, as seen by the figures. 



4. Sclerous Tissues. 



72. Bones and Teeth.— These constitute the bones and 

 teeth, and are composed of an animal basis of fibers and cells ce- 

 mented together by phosphate and carbonate of lime. Fig. 19, 

 which is a transverse section of one of the bones of the arm, 

 will give an idea of the arrangement of the animal matter, 

 the earthy part having been dissolved by acid. Fig. 20 shows 

 a transverse section of the shoulder blade, exhibiting the dark 

 spaces called lacunae. 



71. Describe fat and cartilage. 72. What is the composition of the bones and th« 

 teeth ? 78. What are the capillaries and absorbents? Give the size of the capillar ids. 



