562 DR. E, KLEIN. 
Thickness of osseous lamina outside the lateral labium of 
Jacobson’s cartilage ; P é 4 : - . 0°05 mm. 
Long transverse diameter of the lumen of Jacobson’s organ . 0°6875 ,, 
Short ” ” 3 ee) ” . 07135 ” 
Short transverse diameter of the whole organ of Jacobson, 
exclusive of the cartilage, measured across the middle on SABE Gs 
Thickness of the epithelium of the lateral wall . : , OD4S 
Greatest thickness of the glandfold, inclusive of epithelium . 0°1656 ,, 
Greatest height diameter of this glandfold, ¢.e. in an upward 
and downward direction . j : 5 . ; . 0852. . 
Thickness of the elastic layer ‘ ; ; . 0°008 to 0016 _,, 
= ts cavernous layer in the middle of the lateral 
wall. i : : ; : . O338 5, 
ra és mucous membrane of the median wall, ex- ] 
clusive of the sensory epithelium . «> O335'es, 
“s sensory epithelium : . 0°136 to 0'°225 ,, 
rF) - 
Transverse diameter of a large olfactory nerve trunk in the 
median wall rp ; : 0144 by 0216 _,, 
Diameter of a lymph-follicle within the sensory epithe- 
lium . : : : . . ‘ : . 0194 by 0252 ,, 
In addition to the description given in the preceding pages of 
the structure of the different parts constituting the wall of the 
organ or tubes of Jacobson, we have now to state various points 
of detail not yet mentioned. 
1. As regards the lateral wall. 
(az) As mentioned above, the epithelium lining this is strati- 
fied columnar, being composed of three layers of cells ; a superficial 
layer of conical or cylindrical cells, each with an oval nucleus ; a 
deep layer of inverted conical cells, z.e. cells whose base is fixed 
on the subepithelial layer and whose pointed process is directed 
towards the free or inner surface, each of these cells possess a 
more or less spherical nucleus. Between these two layers of cells, 
especially between the superficial cells, there is a middle layer of 
cells composed of spindle-shaped cells, each with an oval nucleus. 
The nuclei of the superficial cells are the largest. In specimens 
hardened with spirit, the nuclei of the superficial conical cells 
and of the spindle-shaped cells appear as if situated in the same 
layer, and it then appears as if the epithelium were made up of 
two layers only. 
On the inner or free surface of the superficial cells is a distinct 
and sharp boundary line, but there are no cilia projecting beyond 
this boundary line. In the guinea-pig the superficial cells of 
this epithelium possess cilia, as I have pofnted out in my first 
paper, and I have then doubted Loewe’s! assertion as to the non- 
existence of cilia on this epithelium in the rabbit’s organ. But 
I now find that in all my specimens of the rabbit’s organ, be they 
prepared with osmic acid, Miiller’s fluid, chromic acid, or spirit, 
1 ¢ Beitr, zur Anatom. d. Nase und Mundholle,’ Berlin, 1878. 
