54 



MANUAL OF PHYSIOLOGY. 

 FlG. 24. 



cl 



Transverse section of the chorda dorsalis and neighboring substance. a, cartilage 

 cells; b, cell of the middle layer of embryo; c, mucous tissue; d, boundary of chorda. 

 (Cadiat.) 



FIG. 25. 



Cells of mucous tissue with branching processes (B) and a couple of elastic fibres (F). 



(Ranvier.) 



