12 



THE ELEMENTARY TISSUES 



(i) Mucous Tissue. This is the most immature form of 

 connective tissue and consists of a loose protoplasmic net- 

 work having a gelatinous intercellular substance. It 



is 



FIG. 7. Tissue of the jelly of Wharton from umbilical cord. 



a, Connective-tissue corpuscles; b, fasciculi of connective-tissue fibers; c, 

 spherical cells. (Halliburton after Frey.) 



FIG. 8. Reticular tissue from a lymphatic gland, from a section 



which has been treated with dilute potash. {Halliburton after 



S chafer.} 



found in Wharton's jelly in the embryo and in certain tu- 

 mors, known as myxomata. 



(2) Reticular Tissue. This is composed chiefly of a net- 

 work of connective-tissue cells which enclose a mass of lym- 



