GEXEEAL PART. 



phora). The so-called secreted tissue of young Ctenophora, and the 

 gelatinous tissue of Medusae and Echinoderin larvae, into which cells 

 eventually migrate, being at first absent, has a similar relation 

 (fig- 26). 



FIG. 26. Gelatinous tissue of Rhizostoma. F, fibrous network ; Z, cells with processes ; 

 Z', the same in division. 



Reticular connective tissue consists of a network of star-shapei 

 and branched cells, the spaces of which contain another kind of 

 tissue element. In the so-called adenoid tissue, which functions as 

 the supporting tissue of the lymph glands, the contents of the inter- 

 cellular spaces are lymph corpuscles. 



A form of connective 

 tissue very widely scat- 

 tered amongst the Ver- 

 tebrates is the so-called 

 fibrillar connective tissue 

 (fig. 27). This consists 

 of a large proportion 

 of spindle-shaped, or 

 branched cells, and of a 

 solid intercellular sub- 

 stance, which is totally 

 or partially broken up 

 into bundles of fibres and 



FIG. 27. Filjnllar connective tissue. 



possesses the property of 



yielding gelatine on boiling. If the protoplasm of the cells is mostly 

 or entirely used up in the formation of fibres, fibrous tissue is produced 

 v;ith nuclei in the position of the original cells. Very often the 



