20 OLOF LARSELL 



kitten from which figure 1 was drawn, is interesting in showing 

 the same manner of distribution of the larger strands as is seen 

 in the reconstruction. It also indicates, somewhat more clearly, 

 the position of the ganglion cells along the main trunk of the 

 nerve. This specimen differs from the one illustrated in figure 

 3 in that the main ganglionic mass (gii) has fewer ganglion cells 

 than are present in the corresponding ganglion (gn, fig. 3) of the 

 other kitten of the same age. More numerous cells, however, 

 are scattered along the nerve trunk, so that the total number is 

 approximately the same in the two specimens, if the smaller 

 ganglia, not observed in the dissected animal, are left out of 

 consideration in both. 



The finer strands, which radiate in various directions from 

 what may be designated the central bundle, follow along or soon 

 reach, blood-vessels of various sizes. Many similar strands, 

 consisting of but three or four fibers could not be seen with the 

 low magnification of the projection apparatus used in plotting 

 the figure, and are not included in this reconstruction. These, 

 if represented, would make the plexus much more intricate, 

 especially in its rostral part, and would cause it to extend further 

 rostrally over the olfactory bulb than is figured. 



The course of the nervus terminalis in the nasal septum was 

 followed to best advantage in methylene-blue preparations, fixed 

 in ammonium-picrate and mounted in a mixture of anmionium 

 picrate and glycerine. The silver preparations brought out 

 more clearly the finer strands, but the distortion of the septum 

 produced by this technique made it difficult to follow the general 

 course of the various branches by the method of reconstruction. 



The nasal septum of a kitten one day old was removed and was 

 kept moistened for forty minutes in a 0.25 per cent solution of 

 methylene-blue in physiological salt solution. The preparation 

 was examined from time to time until a differentiation was ob- 

 served between the main bundles of the vomeronasal nerves and 

 the smaller bundles which course parallel to them and which 

 had previously appeared to be part of them. These smaller 

 bundles assumed the blue color characteristic of this stain, while 

 the vomeronasal nerves remained practically unstained. After 



