164 The Alligator and Its Allies 
animal the glands hereshow their cell details far more 
clearly than in the former tissue; this may have 
been partly due to the latter sections being thinner. 
The glands are of a compound, tubulo-alveolar 
type; although 
numerous sec- 
tions through 
ducts were ob- 
tained (as in 
Fig. 39), no de- 
tails of these 
ducts could be 
seen. 
AS noted 
above, and as 
sk may be seen by 
Fic. 39. One of the glands from the poste- comparing Ag igs 
rior region of the tongue of the feedinganimal, tures 37 and 39, 
under somewhat higher magnification than the gland during 
used in Figure 37; av, alveolus; d, duct of : 
gland; e, stratified epithelium. hibernation, at 
least in the an- 
imals studied, consists of many more alveoli than 
during the feeding season; this, of course, might 
not prove to be always the case if larger num- 
bers of animals were studied; the difference in 
the ages of the animals might have caused 
this difference in the glands. In the material 
studied the largest glands from the hibernating 
animals consist of more than twice as many alveoli 
as the glands in the feeding animals. As seen 
d 
