MEMOIRS. 
The Oxcan of Jacopson in the Rassir. By H. Kuziy, M.D., 
F.R.S., Lecturer on Histology and Embryology in the Medical 
School of St. Bartholomew’s Hospital. (With Plates XXX 
and XXXII.) 
In continuation of the research of the organ of Jacobson in 
mammals, that of the guinea-pig having been described in the 
January and April numbers, 1881, of this Journal, I now propose 
to give the results of the minute examination of this organ in the 
rabbit. The differences in the microscopic anatomy of Jacob- 
son’s organ in these two rodents are very great indeed, much 
greater than could be anticipated. That of the rabbit in many 
respects comes very close to the ideal type which Gratiolet1 
draws and describes, and is also similar to the organ in the sheep 
as described by Balogh. The points of resemblance between 
that of the rabbit and the sheep and the points of dissemblance 
between that of the rabbit and the guinea-pig will be fully dis- 
cussed below. 
In describing the organ of the rabbit, we shall take note, as 
we did in the guinea-pig, of the surrounding parts, in the region of 
the organ of Jacobson, since all the parts constituting the organ 
of Jacobson bear an intimate relation to the tissues around them. 
In the rabbit, the facial part of the head being longer than in 
the guinea-pig, it naturally follows that the nasal septum, and 
consequently also the organ of Jacobson, are of greater length in 
the former than in the latter animal. When fully exposing the 
front part of the septum nasale, from the dorsum of the nose to the 
lower nasal furrow, by removing the lateral wall of the nose as 
well as the lower concha or lower turbinated bone—which by its 
very beautiful plication contrasts in a conspicuous manner with 
the comparatively smooth lower concha of the guinea-pig—the 
1 ‘Recherches sur l’organe de Jacobson,’ Paris, 1845, p. 19, aud passim, 
2 *Das Jacobson’sche Organ des Schafes, Sitzungsb. d. K. Akad. d, 
Wiss.,’ xlii, p. 449. 
VOL. XXI.—NEW SER. 00 
