SYSTEMATIC SYNTHESIS OF TISSUES. 185 



which is very much like Gelatine, in which are imbedded 

 a great number of cells containing a small amount of 

 earthy matter, like that of the Bones. 



FIG. 147. 



Fig. 147 represents a por- 

 tion of cartilage or gristle 

 with nucleated cells imbed- 

 ded in it. Some of them 

 have two nuclei, and appear 

 to be dividing to form new 

 cells. The fibro-cartilage 

 will be represented, and car- 

 tilage further illustrated, in 

 connection with Bony Tissue. 

 (See Fig. 41.) 



178. FIBRO-CARTILAGE OR SINEWY-GRISTLE is com- 

 posed of a varying proportion of fibres and gristle, all 

 the way from a very few fibres up to nearly all fibres 

 and a very few cells. 



179. THE GRISTLY TISSUE is passive in its offices, 

 and does not require the activity-giving Elements of the 

 second group ; it is therefore composed, like the Sinewy 

 Tissue, of inactive Elements, with a small portion of 

 earthy matter combined. 



Remark. As Cartilage or Gristly tissue is liable to compression for 

 a considerable length of time, it would not be proper to have Blood- 

 tubes extend through it. Therefore its nourishment, like that of liga- 

 ments and tendons, must come into it from Blood-tubes near its sur- 

 faces. The passage of nutritious substances into and of waste substances 

 from the inner portions of the cartilages must be slow, though not as 

 slow as in the case of ligaments ; and of course their restoration from 

 injury will be correspondingly tedious. 



SECTION VI. 

 Bony or Osseous Tissue. 



180. IP A BONE IS EXPOSED TO A CONSIDERABLE 



HEAT for some time, it becomes very brittle and crum- 



Describe Fig. 147. 173. Describe . 179. What said of ? How nourished? 

 ISO. What? 



