THE STRUCTURE OF MUSCLE. 



91 



semi-fluid, but it hardens and becomes solid immediately 

 after death. 



Examined, with high magnifying powers, in this 



Fig. 19. — Antaeus fluviatiUs. — A, a single muscular :fibre ; transverse 

 diameter jigth of an inch ; B, a portion of the same more Mghly 

 magnified ; C, a smaller portion stiU more MgMy magnified ; 

 D and E, the splitting up of a part of fibre into fibrillse ; F, the 

 connexion of a nervous with a muscular fibre which has been 

 treated with acetic acid, a, darker, and i, clearer portions of the 

 fibriUse ; «, nucleus of sarcolemma ; mt'.nerve fibre; s, sarcolerama; 

 t, tendon; 1 — 5, successive dark bands answering to the darker 

 portions, a, of each fibrilla. 



