40 



fortune to discover the axis-cylinder process of any of them, except 

 that in a single instance we saw a side arm from one of the smaller 

 cells apparently conjoin itself with the varicose plexus, the cell with 

 its connections being represented in fig. 10; nor have we been able 

 to discover the presence of definite nuclei or nucleoli within their 

 limits, though very rarely there has been some appearence of a lighter 

 zoDe toward the central portion of a few (fig. 7), but the majority 

 are as intensely blackly stained as are ordinarily the smaller nerve 

 cells of the cerebral cortex by the silver method. The protoplasmic 

 extensions are occasionally cut somewhat closely to the body, or are not 

 stained beyond a certain limit, and appear as stumpy black pro- 

 jections ; but more frequently long processes, slightly uneven in contour, 

 may be followed over considerable distances, conforming to the inter- 

 lines of the muscular bundles, an finally ending abruptly between them 

 without trace of any further continuation. Rarely a bulbous enlarg- 

 ement of the termination is found (fig. 11), as if the impregnation 

 had suddenly ceased at the giving off of a ramus, or the formation 

 of one of the irregular thickenings. Curious arborescent figures may 

 also now and then be met with at the terminal portion of some of 

 the protoplasmic arms (fig. 7). 



These apparently sympathetic ganglion cells have not been stained 

 in considerable numbers in any of our preparations; in sections made 

 in accordance to the rules of the rapid Golgi method they very rarely 

 are found, and with but one exception (fig. 8), all our drawings are 

 made from picric acid specimens. We have met with as many as 

 eight or ten in a section, and in one preparation, in a single field 

 magnified ninety diameters, we found three of the cellular bodies not 

 more than 200 (x from the apex of the left ventricle. Figure 6 re- 

 presents one of these three ganglion cells. All of our preparations 

 were made from hearts that had been divided at the auriculo-ventri- 

 cular groove, hence we are unable to state whether the ganglion cells 

 in the wall of the auricle are likewise stained by the silver methods. 

 Isolated ganglion cells have been found scattered nearly everywhere 

 in the muscular tissue of the ventricle, both deeply and superficially 

 situated, but as already mentioned in sparing numbers. 



Figures 8, 9, 10, 11 represent the most common types of ventri- 

 cular nerve ganglia, which are always somewhat smaller than the types 

 from which figs. 6 and 7 are drawn, and it may possibly be that 

 some of the ganglia developed in the paths of the larger, non-varicose 

 nerve fibres are identical with them, though they appear to be a little 

 larger than any of the swellings in the course of the fibres coming 



