396 THE NASAL REGION IN EUTAENIA. 
with their situation, oftenest of small spherical form and granular 
contents. : 
The olfactory portion of the wall of the cavity may be divided for 
the purpose of description as follows : 
(az) The mucous stratum, lying adjacent to the cartilaginous plate ; 
it is constituted of large pigment cells, nerve fibres and capillaries, 
forming a plexus, which surrounds the branch tubules of Bowman's 
glands. 
(8) The sensory stratum, resting on a, which is composed mainly 
of the nuclear portions of the sensory cells, arranged in 8-10 layers. 
The central processes of these are much more delicate than the 
peripheral, and in many places in my preparations are seen to ba 
continuous with olfactory nerve fibres. The peripheral processes 
exhibit a marked wavy contour, and in specimens, subjected to the 
action of Miiller’s Fluid, appear possessed of granular contents. 
Outside and beyond the cells of y, these abruptly become slender, 
forming the so called sense hairs, (the Riechhirchen of Max Schultze) 
directed into the nasal cavity. These, when examined in salt solu- 
tion, exhibit considerable movement, their axes becoming every now 
and then wavy. At their origins are to be observed delicate swellings. 
The nucleus of the sensory cell is perfectly spherical, and, like the 
protoplasm surrounding it slightly glanular. 
(y) The superficial stratum, composed of cylindrical epithelium 
cells with oval nuclei lying between the peripheral processes of £. 
The central ends of these are very delicate, and are not branched. I 
have not observed any longitudinal striation on their surface. Form- 
ing the outer terminations of these cells and encasing the delicate 
swellings of the sense hairs, is seen, with favorable lght, a distinct 
border structure, corresponding to a membrana limitans olfactoria. 
Through this the protoplasm of the cylindrical cells sends out exces- 
sively fine cilia which are seen in their entirety in salt solution, but 
when macerated, too often form only a granular precipitate at the 
border of the cell. They do not reach nearly the same length as the 
sense hairs, and exhibit a very slow movement, their axes remain- 
ing perfectly straight all the while. Sometimes these are obscured 
by the mucous and mucous cells from the adjacent glands. 
At the junction of the olfactory with the mucous portion of the 
nasal walla great development of Bowman’s Glands is to be observed ; 
their size here is extraordinary compared with those of other portions. 
They are composed of cells of two forms, those in the depth of the 
gland being large and almost spherical. As they approach the aperture 
of the gland they gradually become smaller, assuming a rhombohedral 
form. The large cells in ordinary stained preparations do not show 
