114 



CHILD. 



to the peripheral parenchyma and finally becomes visible on the 

 surface in the rounded contour of the proglottid and the furrows 

 marking it off from others. Later growth, while including all 

 parts of the proglottid, is greatest in amount in the central pa- 

 renchyma. The relative increase in length and width of the 



FIG. 71. 



proglottid is considerably greater than its increase in thickness. 

 The folds forming the posterior borders of the proglottids are 

 formed by the localized growth of the peripheral parenchyma, 

 and since growth begins here considerably later than in the cen- 

 tral parenchyma, these folds are comparatively late in making 

 their appearance. 



( To be continued. ) 



