86 ELEMENTARY PHYSIOLOGY. [VIII. 



b. The cut ends of the fibres are finely dotted 

 corresponding with the fibrillae; sometimes 

 the cut ends are divided into larger polygonal 

 areas (areas of Cohnheim), this appearance is 

 produced by the hardening agent. 



c. The nuclei lying just beneath the sarcolemma, 

 few or none being imbedded in the muscular 

 substance of the fibres (cp. 5 c). 



d. In some part of the section, the fibre-frag- 

 ments may be turned over and lie length- 

 ways ; in these the striation and tendency 

 to break into fibrillae may be noticed as in 

 frog's muscle. 



9. Remove the peritoneum from a part of the 

 intestine of a recently killed mammal, and tear 

 off with fine forceps a strip as thin as possible of 

 the longitudinal muscular coat. Place this in 

 potassium bichromate '1 p.c. or in 30 p.c. alcohol 

 for two days, wash with water, stain with picro- 

 carmine, wash and tease out in .dilute glycerine. 

 Note 



a. The isolated fibre-cells. These are long, and, 

 when not broken off in the preparation, fusi- 

 form masses of hyaline or faintly granular 

 protoplasm. They appear very much thinner 

 when seen in one direction than in another ; 

 that is to say, they are much flattened. In 

 the middle of each fibre an elongated nucleus 

 will be seen stained deeply. In the neigh- 

 bourhood of the nucleus, especially at its 



