18 Effie A. Eead 



3. The olfactory nerve fibers as central prolongations of the olfactory cells 



and the character of their termination in the olfactory bulb. 



4. The relations of the olfactory nerve fibers in their passage from the 



sensory epithelium to the olfactory bulb. 



5. The position of the vomeronasal or Jacobson's organ and its sensory 



epithelium and nerves. 



6. The relations and terminations of the branches of the trigeminus in the 



nasal mucosa. 



As -will be more fully stated in the body of the paper, I have 

 employed in this work the methods necessary for showing clearly the 

 gross anatomy, and for the fine anatomy the three standard histological 

 methods: (1) Gold chloride; (2) chrome silver or Golgi method, and 

 (3) the methylene blue method. 



Except where otherwise stated, the results given depend upon repeated 

 gross dissections and upon clear demonstrations by each of the histo- 

 logical methods. That is, no statement has been made which has not 

 been abundantly verified. 



ISTaturally the quality of the human material available did not make 

 all the histological demonstrations and verifications so extensive as for 

 the dog and cat. 



1-3. I have demonstrated in the clearest possible manner that the 

 olfactory sensory cells are present in the slightly pigmented mucosa on 

 the conchas and septum usually designated as olfactor}^ and that the 

 sensory cells are true nerve cells and their central prolongations are the 

 olfactory nerves, which extend to the olfactory glomeruli in the olfactory 

 bulb. This work is confirmatory of the published results briefly sum- 

 marized in the historical part of this paper. 



My results as to the extent of the Olfactory Eegion in man differ 

 considerably from those of von Brunn. the latest and most quoted 

 authority npon this point. He shows only a small area upon the 

 septum and superior concha as olfactory (Figs. 28, 29). My dissection 

 shows that the olfactory nerves extend over a much larger area, al)out 

 one-third of the septum and nearly the whole of the superior concha 

 (Figs. 30, 31). 



4. With regard to the relation of the olfactory nerves in their passage 

 from the olfactory cells to the olfactory bulb, the results of my work 

 are strikingly different from the published statements of human and 

 comparative anatomists from the time of Scarpa to the present. 



Xaturally the conditions are more completely described for man than 

 for the lower animals. The figures of Leveille have been and still are 



