MINUTE ANATOMY OF NASAL MUCOUS MEMBRANE, 109 
layer only, both in the lateral and median walls ; but towards the 
upper and lower sulcus their number is much diminished. In 
those parts where the tube is larger; e.g. in the front part, the 
number of these vesicles is greater than where the tube is smaller. 
Where they are most numerous they are situated so closely 
that they are separated from one another by epithelial masses, 
whose breadth is not much greater than that of themselves, 7. e. 
the vesicles. The dome of these vesicles, z. e. the surface nearest 
the lumen of the tube, is covered with the columnar superficial 
epithelial cells only ; they are here less of a conical but more 
of a cylindrical shape, and shorter than the cells of other places. 
Above the middle of the dome the epithelial cells are reduced 
to about 0:016 mm. in length, ze. half the length of the 
conical cells of other places. 
Each of these vesicles is connected with the internal lumen 
of the tube by several minute canals extending between the 
epithelial cells forming the dome up to the free surface. With 
the subepithelial membrane the vesicle is connected by a ver- 
tical or slightly oblique channel. This latter is much larger 
than the ones leading into the inner cavity, and may be appro- 
priately spoken off as at the neck. Its breadth is measurable ; 
it amounts to 0:005 mm., while its length is about 0°02 mm. 
The deep stratum of small epithelial cells, described above, is 
partly invaginated by the passage through it, of the neck 
of the vesicle, the small cells not reaching further than the 
point of connection of the neck with the vesicle. The neck, 
together with the vesicle, resembles a flask-shaped organ; the 
former contains, and is, in fact; filled with a cord-like continua- 
tion of the subepithelial membrane, and it consists of a tissue,. 
in which occasionally a capillary blood-vessel, a few spindle- 
shaped looking cells, or a nerve-fibre can be recognised. This 
tissue is continued into the vesicle, but fills only a small part of 
the cavity of this latter. In some rare instances I have seen 
two vesicles connected by a horizontal broad channel. The 
vesicles and their neck could be compared with the papille of 
other membranes, but this comparison would not be quite 
correct, inasmuch as in an ordinary papilla, the epithelium, as 
a whole, is inflected over this latter, whereas in our present 
instance the flask-shaped vesicle penetrates, as it were, into the 
layer of the epithelium. 
The case of the penetration of capillary blood-vessels and 
pigmented cells into the epithelium of that portion of the liga- 
mentum spirale, known as the stria vascularis in the cochlea, could 
be perhaps more appropriately adduced, and is in a certain sense 
similar to our own case. A penetration of capillary blood-vessels 
