OF THE JUNCTION OF MUSCLE WITH TENDON. 229 



numbers. See my paper in the " Transactions of the 

 Microscopical Society, 1864." 



268. Of the junction of muscle with tendon. If 



an elementary muscular fibre attached to its tendon, 

 taken from a properly prepared specimen, be ex- 

 amined, it will be seen that the formed material of 

 the muscle is directly continuous with that of the 

 tendon, and that the oval masses of bioplasm bear to 

 the formed material of the two textures respectively 

 a similar relation. In specimen 96 these points are 

 well illustrated, and the observer who considers care- 

 fully the facts demonstrated in specimen 99 of de- 

 veloping muscle, in 105 of young and fully formed 

 muscle, and in 104 showing the junction between 

 muscle and tendon, will, I think, feel convinced that 

 the formed material of muscle is produced by the 

 bioplasm, and that for its development and growth 

 muscle is dependent entirely upon this living sub- 

 stance, which in the adult exists in very small 

 proportion. 



269. Development of muscular tissue. At an early 

 period of development the masses of bioplasm which 

 take part in the development of striped muscle divide 

 and subdivide so as to form rows. The delicate 

 formed material which is produced upon the outer 

 surface of these gradually acquires consistence and 

 exhibits contractility. At first there are indications 

 of faint longitudinal striations, but transverse mark- 

 ings become visible as soon as the tube of contractile 

 tissue thus produced acquires the thickness of about 

 the 5 ^ O th or A \ O th of an inch. A beautiful speci- 

 men of developing muscular fibre, in which all these 

 points are clearly demonstrated, is seen in prep. 102, 

 from, the calf at an early period of development. 

 These elementary fibres, however, only serve a tem- 

 porary purpose, and gradually give place fco elemen- 

 tary fibres of a different structure. The fully formed 

 muscular fibres of some insects exhibit precisely the 



