258 The Microscope. 



Similar cases were found in other fascicules, showing clearly how 

 fibers interdigitate (Figs. 19-22).* 



Dissected preparations show similar facts which have been 

 already mentioned, especially in See. 4, a and h. They also show 

 the following special relations: Intramuscular ends were frequently 

 found in juxtaposition to fibers of full size (Figs. 35-36), and 

 occasionally two tapering, intramuscular ends of fibers from the 

 same or opposite tendons were found closely connected (Figs. 

 37-38). The nature of the connection and whether efFected by a 

 cell cement or some other means was not determined. In many 

 cases intramuscular ends were entirely free from other fibers, 

 especially in the sparrow, in which few cases were found of closely 

 adhering ends, and the question must be raised whether the above 

 mentioned connection would not also have disappeared with further 

 action of the reagent. At least it was found that caustic potash 

 dissolved the connections much more completely than nitric acid. 



Striated, tapering ends, which may also be called intra- 

 muscular, were found in the oesophagus of the mouse and bat, 

 surrounded by and closely connected with unstriated fibers (Fig. 

 46), as previously described for the lai'ger animals. 



The methods of preparation used were not favorable to the 

 study of the relations of tendinous ends to other parts, but in 

 some of the polygasti'ic muscles, the narrow raphes connecting the 

 sections of the muscle were not dissolved, thus leaving the tendin- 

 ous ends in their natural relations. They are generally irregularly 

 truncate, and come very near together, end to end, one large end 

 frequently being opposite a number of small ones (Fig. 47). 



12. Anastomoses. — Besides the connection of intramuscular 

 ends with other fibers, mentioned in the last section, it was found 

 that in the mouse the connection is occasionally still more intimate, 

 true anastomoses taking place between fibers. Transitional forms 

 between the two extremes were found. Figs. 37-44 may be 

 considered as a series, showing the degrees of attachment between 

 fibers; in Figs. 37-38 the fibers are simply in juxtaposition; in 

 Fig. 39 three are fine processes on circumscribed parts, mvi, of 

 each fiber, which apparently dov.etail together, the union between 

 the fibers being close; in Fig. 40 the uniting branches are long 

 and continuous, but have longitudinal clefts, as at tuTrix in Fig. 

 41 the clefts may be considered as much more marked, separating 

 several small branches fi'om each other; in Figs. 42-44 the 



*Figs. 1-34 are found in PI. VIII-X, of Part I. 



