26 



VETEKINAEY PHYSIOLOGY 



the epithelia by having the formed material leticeen and not 

 in the cells. They are composed of the following parts : 

 I. Formed material. 

 (a) Fibres, 

 (6) Matrix. 



II. Spaces (Connective Tissue Spaces). 

 III. Cells. 



I. Formed Material. (A) Fibres (fig. 9) Is*. Non-elastic 

 (White Fibres). These are delicate, transparent fibrils arranged 



FIG. 7. Mucoid Tissue from an eml>ryo rabbit. 



in bundles, which do not branch, and which have a mucin-like 

 matrix between them. They are composed of a non-elastic 

 substance, collagen. This is closely allied to the proteins, and 



Fio. 8. Fibroblasts from young fibrous tissue. 



gives the protein reactions faintly, but it does not yield tyrosin 

 when decomposed, while it does yield amino-acetic acid. It is 

 insoluble in cold water, but swells up and becomes transparent 



