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. Afttacus fuviatilis. A. a single muscular fibre; transverse 

 diameter -^th of an inch; B, a portion of the same more highly 

 magnified ; C, a smaller portion still more highly 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 &, clearer portions of the 

 fibrillae ; n, nucleus of sarcolemma ; nv, nerve fibre; s, sarcolemma; 

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

 portions, a, of each fibril la. 



