The Microscope. 231 



muscle and that, in the horse, from the side of some fibers extend 

 "short hook-like appendages," compare Fig. 11. Branched endings 

 have been figured also from the ocular muscles of the sheep 

 (Tergast), the iris of birds (Dogiel ) and some muscles of the cat 

 (Gage). 



In the mouse intramuscular ends in limb and trunk muscles are 

 very numerous and have great variety in the form of the branching . 

 The figures in Plate VIII and IX, though not all taken from the mouse, 

 were found in prototype in that animal. The branches may be near 

 the tip (Fig. 6), or arranged at intervals along the side of the fiber 

 until it is of full size (Fig, 13), or the branches themselves may 

 branch (Fig. 17). In the shrew many branched endings were 

 found and the forms varied nearly as much as did those in the 

 mouse. In the bat only two branched endings (Fig. 16) were found 

 but the state of the specimens might account for this, as to demon- 

 strate branched endings it seems necessary to have perfectly fresh 

 material. In the sparrow branched endings are rare and the form 

 of the branching shows less variety and is less marked (Figs. 10 and 

 11) than in the mouse or shrew. 



A few endings both tapering and branched, which could strictly 

 be called intramuscular, were found in the skin of the mouse (Fig. 7), 

 while in the tongue one tapering and slightly branched end was 

 found which was siirely intramuscular. 



The length of the taper before the fiber attains full size 

 varies greatly, in some cases where the fiber breaks up suddenly into 

 branches near the tip, being only 1 mm., in others extending 5 to 6 

 mm. It is usually, however, found to be 2 or 3 mm., and may be 

 said to be from one- eighth to one-fifth of the length of a tapering 

 fiber. 



8. Types of Tendinous Ends. — The tendinous end of fibers, as 

 usually figured, resembles the ends of Fig. 1 and 5, being either 

 slightly compressed, pointed or truncate with short, finger- like 

 divisions. In the small animals these forms are in the majority, but 

 there are also found many endings of quite difPerent forms. Fig. 4 

 shows a form in which the whole end (t) has a great number of fine, 

 short processes, with no striation, giving it a fringed appearance. This 

 form was met with in the mouse, bat and sparrow, and in both nitric 

 acid and caustic potash preparations. Figs. 6 and 32 show tendin- 

 ous ends of various forms, being cleft or having both large and small 

 branches. Some of the branches are given oflP as far as J mm. from 

 the tendon. Forms of this description were found in limb muscles 



