Huber-DeWitt, Nerve-Endings in Muscles. 195 



cylinder einer Nervenzelle des Auerbach'schen oder Meissner's 

 chen Geflechtes, dass er bedeutend dicker und mit varicosen 

 Verdickungen besetzt ist ; zu dem ist erstets nach Verlauf einer 

 oft sehr kurzen Strecke aufs neue einer Teilung unterworfen." 

 Such cells, as Dogiel has shown by injecting the intestinal wall 

 with gelatine, form a perivascular plexus surrounding the intes- 

 tinal arteries, veins, capillaries and lymphatic vessels, and 

 have no connection with the plexuses of Auerbach and Meiss- 

 ner. They are, if we understand him correctly, although he is 

 not explicit on this point, not to be looked on as nerve cells. 

 These cells have now and then been seen by us, especialy well 

 in some methylene blue preparations of the frog's stomach, and, 

 in several instances, showed a very distinct granulation, the 

 granules being relatively large and resembling very closely the 

 granules sometimes stained in methylene blue, in cells which 

 were looked upon as containing basophile granules. Atten- 

 tion must here again be drawn to the fact that not all structures 

 staining blue in methylene blue, even when this stain is inject- 

 ed into the circulation of the living animal, should be looked 

 upon as nervous in nature. This stain does stain nerve cells 

 and nerve fibers most beautifully in some instances, leaving 

 nothing more to be desired, yet, unfortunately, often stains 

 other structures also, and the investigator is often at a loss how 

 to interpret any particular preparation before him. There is, it 

 is true, very often a slight color differentiation, which in some 

 cases is helpful ; the nerve fibres and nerve cells staining a 

 more purplish blue than the other tissues ; this is especially 

 noticed in the axis cylinders of nerve fibers ; yet this statement 

 is open to many exceptions. These facts will, we believe, ex- 

 plain many of the discrepancies noticed in the accounts of 

 writers, working with similar methods and on the same tissues. 

 We are therefore led to agree with Dogiel in considering 

 the cells described by Schultz as other than nerve cells, proba- 

 bly cells of connective tissue origin. And while we have not 

 been able to add materially to the observations of Erik Miiller, 

 Retzius and Dogiel, and to that portion of Schultz's account 

 which pertains to the endings of motor nerves in involuntary 



