The Mickoscope. 2G5 



specimen has bi'anches at intervals for 1 mm., where it becomes of 

 full size. From the biceps femoris of a house mouse. 



Fig. 42. — An anastomosis of two fibers, the connecting 

 branches being seen at the side of one fiber, on the surface of the 

 other. In the specimen the smaller fiber x continues to branch, 

 and about 1 mm. from this point ends in a fine point. From the 

 biceps femoris of a house mouse. 



Fig. 43. — An anastomosis of two fibers in which the connecting 

 branch passes over a third fiber. From the biceps femoris of a 

 house mouse. 



Fig. 44. — An anastomosis in which the smaller of the con- 

 nected fibers X is seen to have a tapering end. From the biceps 

 femoris of a house mouse, dissociated in caustic potash. 



Fig. 45. — The anastomoses of one tapering fiber with two 

 others from the opposite tendon, showing in a typical way the 

 relations of anastomosing intramuscular ends to each other. The 

 portion from ii to v represents 3 mm., while the whole muscle is 17 

 mm. long. The intramuscular ends are branched and two of them, 

 after anastomosing, end freely. From the biceps femoris of a 

 house mouse. 



PLATE XII. 



Magnification of Figs. 46-51, 260 diameters; Fig. 52, 660 

 diameters; Figs. 53-55, 25 diameters; Figs. 56-69, 45 diameters. 



Fig. 46. — The tapering end i of a striated fiber from the 

 cardiac end of the oesophagus of a gray bat. It is branched and 

 is seen in situ, surrounded by unstriated fibers. 



Fig. 47 — Tendinous ends of the rectus abdominis, a polygas- 

 tric muscle, from a house mouse. T and t, ends of a fiber 5 mm. 

 long. V, ends of much smaller fibers, seen in their natural 

 relations opposite to T on the other side of the narrow tendinous 

 raphe. 



Fig. 48. — A tapering end from the tongue of a mouse, with a 

 tubular prolongation of the sarcoiemma apparently extending 

 beyond the sarcous substance. 



Fig. 49. — A portion of a fiber from the latissimus of a shrew, 

 in which the sarcous substance has separated, the tubular sarco- 

 iemma bridging the interval, n, a nucleus on the sarcoiemma. 



Figs. 50 and 51. — Tendinous ends, from which extends a 

 transparent sheath, apparently a prolongation of the sarcoiemma 

 beyond the sarcous substance, which terminates in fine fringed 

 processes showing no sign of striation. From a short muscle of 

 the back of a house mouse. 



