354 CHARLES BROOKOVER 



of the sections and the probabihties are that not more than half 

 the cells would have been enunierated twdce. This would give 

 a minimum of one thousand, but there are reasons for believing 

 that the number is not far from the count as made. There are 

 two regions, one anterior n(^ well impregnated and another pos- 

 terior where too black (blank as to n. terminalis in fig. 1), where 

 cells should have been found. Then too, there is probability 

 of overlooking some isolated scattered cells. In making the 

 count there was a tendency to follow the main rami of the nerve. 



Figure 1 shows fairly accurately, we think, the field of dis- 

 tribution of the cells of the n. terminalis. As has been found to 

 be the case in other vertebrates in the main, the territory of the 

 peripheral cells is confined to the septum and generally fairly 

 accurately corresponds to the area covered by the fila olfactoria 

 in their distribution to the muscosa. This point could not be 

 accurately determined in this preparation. Although fibers 

 that were thought to belong to the nervus terminalis were in a 

 few instances found accompanying the blood vessels and fila to 

 the turbinated bones, no cells were found along the course of these 

 fibers to make the matter certain. Our preparations were not 

 favorable for the determination of this point. That the nerve 

 may be independent of the olfactory nerve is indicated by its 

 presence in the porpoise where the olfactory fila are supposed 

 to be absent according to Johnston ('14). 



Although the cells are more numerous at intersection points 

 in the whole peripheral n. terminahs, the semidiagrammatic 

 representation in figure 1 gives only the position of the chief 

 groups of cells. From figure 2 it will be seen that there are occa- 

 sional cells along the fibers. In this drawing there is a careful 

 representation of all the cells in position, as nearly as could be 

 done in construction from several sections. Perhaps there are 

 more cells than shown in the main ramus where cells are rather 

 frequent all along the nerve. The fibers in this drawing are 

 somewhat conventional and too few, but give an idea of the 

 open character of the fibrous network in the n. terminalis. 

 This is in contrast with the more compact arrangement of other 

 nerves encountered in the nose. This character, along with 



