MINUTE ANATOMY OF NASAL MUCOUS MEMBRANE. 111 
greater than at the first. The thicknesses of the mucous mem- 
brane of the three places in the preparation from which fig. 1 
is taken are 0°25, 0°29, 0°36 mm. 
The glands are serous glands; there are no other glands here. 
Their structure is identical with that described above of the lateral 
wall of the organ of Jacobson. The alveoli are tubes, wavy and 
convoluted, some more branched than others; their transverse 
diameter is about 0:02 to 0°036 mm.; their lumen is very 
minute, and they are lined with a single layer of columnar or 
polyhedral, granular-looking cells, the nucleus of which is 
situated in the outer part of the cell. 
The ducts are identical with the intralobular ducts in the 
salivary glands, 7. e. Pfliiger’s salivary tubes; their epithelium is 
a single layer of beautiful columnar cells, whose outer portion is 
conspicuously longitudinally striated ; their nucleus is spherical, 
and contained in about the middle of the cell. 
The lumen varies between 0°0135 and 0:019, the whole dia- 
meter of the duct, including the entire epithelial wall, being 
between 0°04 and 0:05 mm. 
The cartilage of the septum is hyaline, but the cartilage cells 
show this peculiarity, that in many places they contain minute 
fat-globules. In some places they are quite filled with them, 
and in specimens that have been prepared with osmic acid the 
cartilage cells appear then filled with black spherules. When 
dissolving away the fat-globules the honeycombed reticulated cell 
substance becomes very evident, and is identical in appearance 
with that presented by the epithelial cells of the alveoli of the 
‘sebaceous and Meibomian glands. 
The groove between the septum and the alveolar process of 
the superior maxilla is lined with a thin mucous membrane, the 
free surface of which is covered with the same ciliated columnar 
(stratified) epithelium as the septum. 
Small groups of alveoli of serous glands are found in very few 
places. ‘The tissue of the mucous membrane is infiltrated with 
lymph-corpuscles ; in the outer wall of the groove, 7. e. on the 
alveolar process of the superior maxilla, these infiltrations amount 
occasionally to a distinct lymph-follicle (see fig. 1,13). The ade- 
noid tissue of the lymph-follicle penetrates into the epithelium of 
the surface, in the same way as is seen in the summits of the 
lymph-follicles of the Peyer’s glands and on the tonsils. I 
measured one such follicle, oval in shape; its long diameter is 
about 0°28 mm., its short diameter 0°16 mm. The follicle lies 
close to the epithelium ; this latter is here much infiltrated with - 
adenoid tissue, but, on the whole, thinner by about one fourth 
than the ciliated epithelium of the neighbourhood. 
