MINUTE ANATOMY OF ORGAN OF JACOBSON IN GUINEA-PIG, 229 
The two ducts being close side by side, it follows that the 
two semilunar cartilages meet at their extremities, and thus 
form nearly a cumplete capsule for the two ducts (see figures 
9 and 10). There is a smaller or larger apparentiy isolated 
nodule of cartilage found between the two ducts. 
Just before the ducts open into the oral cavity the lumen 
becomes a little smaller, cylindrical, and there are here well- 
developed papillz, such as those of the palatine mucous 
membrane. The Stenonian cartilages have become confluent 
with their extremities, and present themselves now in trans- 
verse section as a beautiful heart-shaped capsule, in each of 
whose cavities lies one of the ducts, the apex of the heart 
being directed forwards, the notch backwards (see fig. 10). 
In connection with the apex one or more small pieces of 
cartilage are seen extending into the tissue separating the 
two ducts. 
As regards its structure, the Stenonian cartilage differs 
widely from that of the cartilage of the nasal septum and of 
Jacobson’s cartilage, the Stenonian cartilage being elastic 
cartilage, 7.e. dense networks of elastic fibrils, forming a 
sort of capsule around the individual cartilage cells. These 
latter are remarkable for being identical in appearance with 
well-formed fat-cells. Of the cartilage of the septum I 
have mentioned, in my first’ paper, that in many places the 
cartilage-cells are filled with numbers of minute fat globules, 
an appearance well known of some other hyaline cartilages ; 
but here, 7. e. in the Stenonian cartilages, we find each car- 
tilage cell filled with one large oil globule. Being elastic or 
reticular cartilage there is, then, a great similarity between 
the Stenonian cartilage of the guinea-pig and the cartilage 
of the epiglottis of some animals (rabbit, cat, dog), where 
the cells are likewise transformed into fat-cells. 
According to Balogh’, the Stenonian cartilage in the 
sheep is hyaline, and the epithelium lining the duct, speak- 
ing of the Stenonian duct only as situated in the mucous 
membrane of the palatum durum, is stratified and composed 
of flattened and more or less hexagonal cells. 
Kolliker? found, in the adult human subject, the duct 
lined with ciliated columnar epithelium. Both Balogh, for 
the Stenonian duct of the sheep, and Kolliker, for that of 
man, mention mucous glands embedded in the wall of the 
duct and opening into its lumen. 
In the guinea-pig I have searched in vain for these glands ; 
1 L. c., p. 456. 
SU iy Gay! PS Ys 
