PLATE 4 



EXPLANATION OF FIGURE 



5 Section of plasma clot from a tissure culture. X 950. The figure shows 

 the transformation of the fibrin net (F. N.) of a plasma clot into a fibrous tissue 

 (F. T.) as a result of the mechanical factors induced by the movements of the 

 cell through it. Cf. Baitsell, 1915, fig. 19. 



474 



