256 ELEMENTARY BIOLOGY. [CHAP. 



branched fibres, running in bold curves, will be 

 seen: these are yellow elastic fibres, as the 

 acetic acid (a. ft) destroys the white fibrous 

 tissue. 



e. Striped muscle. 



a. Tease out gently a bit of muscle which has been 

 kept in alcohol, and examine with i inch obj. 



a. Composed of elongated fibres, which exhibit 

 a tendency to split up into finer filaments 

 (fibrilla). 



b. Examine with high power. 



a. The alternate lighter and darker bands placed 

 transversely to the long axis of the fibre 

 (transverse striatiori). 



/3. The fine structureless membrane (sarcolemma) 

 enveloping the fibre : seen here and there as 

 a delicate film where the fibre is twisted or 

 bruised. 



y. The tendency to split up into fibrillae. 



c. Tease out a bit of fresh muscle in 075^ sodic 

 chloride solution. 



a. The transverse striation of the fibres: less 

 distinct than in the muscle from alcohol. 



ft. The absence of a tendency to split up into 

 fibrillse. 



y. The sarcolemma, which may be seen at 

 points where the continuity of its contents 

 has been interrupted by pressure, twisting, 

 &c. 



