40 OLOF LARSELL 



The terminations represented in figures 24 and 25 were stained 

 by the gold-chloride method. Those shown in figures 26 and 27 

 are from pyridin-silver preparations. Similar endings were also 

 found by the molybdenum methylene-blue process, in the an- 

 terior cerebral artery and its branches, from which vessels all 

 of the preparations were made. 



The type II endings are strikingly different in appearance 

 from those of type I. As shown in figures 28 and 29, the termina- 

 tions are by somewhat spindle-shaped structures, composed of 

 short, thick branches from the main fiber. These rami end with 

 terminal knobs. In the gold-chloride preparations (fig. 28) a 

 spindle-shaped clear space appears to be enclosed by the short 

 processes which are derived from the nerve fiber. In the silver 

 material no such clear space is evident, although the general 

 contour of the termination is the same as iii the gold preparations. 

 The pyridin-silver slides showed the presence of delicate myelin 

 sheaths on the fibers leading to these terminations. Such sheaths 

 are not clearly evident in the gold chloride material of the cat, 

 although similarly prepared , slides of the corresponding blood- 

 vessels of the beef indicate their presence in that animal. No 

 capsules are present around these terminations in any of the 

 animals in which they were examined. The methylene-blue 

 staining did not clearly demonstrate this type of endings, al- 

 though suggestions of them were visible by this method also. 



In general appearance these end-organs resemble to some ex- 

 tent the corpuscles of Ruffini, but are much smaller. Both in 

 shape, however, and in the absence of a capsule, they bear a 

 stronger similarity to a type of sensory ending found by Dogiel 

 in the heart of the cat (Dogiel, '96, fig. 2, D). Smirnow de- 

 scribes terminations of somewhat similar appearance in the 

 atrial endocardium of the cat (Smirnow, '95, fig. 6), and Michailow 

 ('08) has also described non-capsulated sensory terminations in 

 the myocardium. 



In the anterior cerebral artery and its branches of the cat and 

 of the beef, they lie not in the loose connective tissue, but scat- 

 tered at various levels in the muscular coat itself. 



