Olfactory Apparatus in Dog, Cat and Man 29 



whole mucosa was stained. The thicker sections proved valueless for the 

 olfactory cell. Sections 1 to 3 microns showed the olfactory cells and in 

 some cases a very small part of the axone. Its course is undulating and 

 can be followed only in thick sections. The peripheral process was easily 

 found. 



The Methylene Blue Method. — Huber's modification method was used.' 

 Olfactory cells with their two processes were found in dog and cat. The 

 same difficulty was encountered here as with the gold chloride material, 

 much of the epithelium had been exfoliated. 



Dissociation Method. — The gold chloride material and fresh tissue 

 were placed in formaldehyde dissociator (2 cc. formaldehyde and 1 liter 

 of normal salt solution) for forty minutes. Olfactory cells with their 

 two processes were obtained in dog and cat. 



Gross Anatomy of the Nose.* 



The cavity of the nose (cavum nasi) is divided into two lateral 

 halves by the nasal septum (septum nasi) (Figs. 15-23). This septum 

 is formed of two parts, the septum cartilagineum or cephalic part and 

 the septum nasi osseum which joins the cribriform plate (Lamina 

 cribrosa). In the dog and cat the septum is extended dorsally by the 

 median parts of the os frontale and os nasale. 



In this paper the term septum does not include this area. When 

 referred to, it is designated as the turbinated part of the septum. 



The lateral halves of the nose consist of the turbinated bones 

 (conchffi nasales) (Figs. 15-23). In the dog and cat these conchge may 

 be divided into two parts. The ethmo-turbinals (Figs. 16, 17, 19, 20) 

 and the maxillo-turbinals or concha nasalis inferior (Figs. 15, 18). 

 The ethmo-turbinals are thin plicated bones which are attached to the 

 cribriform plate. In the dog these extend about ^/^ and in the cat 

 about Y2 the length of the nose. Figs. 1 and 3 show the mucosa of the 

 ethmo-turbinals (mucosa nasi), but the bones have been removed. 



The maxillo-turbinal is also a plicated bone situated cephalad of the 

 ethmo-turbinals. This is a larger bone and much more plicated in 

 dog than in cat. 



In man the condition is much different. There are three turbinal 

 bones (concliEe nasales), concha nasalis superior, media and inferior 



^Journal of Applied Microscopy, April, 1898, p. 64. The Methylene Blue 

 Method for staining Nerve Tissue, G. Carl Huber. 



*The B. N. A. terms are introduced as far as possible. 



