THE STRUCTURE OF MUSCLE. 



91 



semi-fluid, but it hardens and becomes solid immediately 

 after death. 



Examined, with high magnifying powers, in this 



t- 



^a^HlEil 



Fig. 19. — A.tfacus fluviatHis.—A, a single muscular fibre ; transverse 

 diameter -jiytli 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 b, clearer portions of the 

 fibril] £6 ; w, nucleus of sarcolerama ; «f, nerve fibre; s, sarcolerama; 

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

 portions, a, of each fibril la. 



