2O2 



AGE, GROWTH, AND DEATH 



fibrillated or differentiated portion of a muscular fibre 

 has no regenerative power. 1 



Let us re-examine another figure, Fig. 69. Here 

 is represented the lining layer of the oesophagus with 

 the cells composing it, the upper ones being horny, 



FIG. 68. STRIATED MUSCLE FIBRES IN PROCESS OF REGENERATION. 

 a, b, three days after rupture of the muscle; c, eight days after rupture; 

 d, 26 days; e, 10 days;/, 21 days;^, 43 days. After Ernst Ziegler. X 350 

 diameters. 



the lower ones those which are capable of active 

 growth. We are rather dull. We do not often stop 

 to think about things. We buy a new horse which 



The regeneration of muscle fibres has been studied hitherto mainly by 

 pathologists, for in the higher animals muscular regeneration occurs chiefly as 

 the sequel of injury to the muscle fibres, injury either mechanical or from path- 

 ological causes, as, for example, in abdominal typhus. The literature of the 



