16 



OLOF LARSELL 



(after injection with same) seven days; decalcification in 7 per 

 cent nitric acid; washing; 80 per cent, 95 per cent, and absolute 

 alcohols with 1 per cent ammonia added to each, ten days alto- 

 gether, to insure thorough dehydration ; pyridin four days ; silver 

 nitrate, after washing, ten days; four per cent pyrogallol in 5 

 per cent formalin two days. All of these fluids except the last, 

 were changed several times. In several of the preparations the 

 strength of the silver solution was varied, beginning with a solu- 

 tion of 2 per cent for several days, then reducing to 1 per cent, 

 to 0.75 per cent, and finally back to 2 per cent. The results in 

 the way of details of structure and of staining the finer fibers, 

 which were obtained by this modification were superior to those 

 given by the unmodified procedure. 



Fig. 2 Right nervus terminalis from same kitten of which the left nerve is 

 shown in figure 1. Removed and mounted entire. X 32. 



1. The nervus terminalis of the cat 



The nervus terminalis of the cat is found on the medial side 

 of the olfactory stalk. The main trunk runs parallel with the 

 ventral border of this stalk, between the fissura prima of the 

 forebrain and the vomeronasal nerves. As shown in figure 1, 

 which represents the mesial aspect of the forebrain and nasal 

 septum of a kitten of two weeks, the nerve is connected with the 

 brain by three strands {r^,r^,r^). They follow closely parallel to 

 blood-vessels of small calibre, which enter the brain near the fis- 

 sura prima. When these vessels were cut at their points of en- 

 trance into the brain, the nerve strands also became detached. 

 This was due to the minuteness of the strands which it was not 

 found possible to sufficiently disentangle from the connective tis- 



