NERVE TERMINATIONS IN LUNG OF RABBIT fis 
mass of low columnar epithelium, shows much more limited 
branching than do the two previously described. The general 
type, however, appears to be the same. There is adaptation to 
the more limited area of epithelium, and in this case, as in 
those previously described, the terminal twigs radiate into the 
surrounding territory of the epithelium. 
A termination of somewhat different appearance is illustrated 
in figure 4. In this instance, and in others resembling it, the 
Fig.5 Graphic reconstruction of two sections cut at 62u, illustrating the rela- 
tion of a nerve fiber and its sensory termination to a respiratory bronchiole and 
two alveolar ducts which arise from the bronchiole. -Rabbit R1, series D4. 
Methylene-blue stain. Camera lucida. 60. 
Fig.6 The nerve termination represented in figure 5, highly magnified. Cam- 
era lucida. X 660. 
terminal arborization presented as a whole an ovoidal appearance 
with the ultimate branches curved. These terminal twigs were 
found in a nodule-like mass of epithelium, which was located at 
the point of bifurcation of a small bronchus into a respiratory 
bronchiolus. 
In figure 5 is represented a graphic reconstruction from two 
sections of a series cut at 62 yu, to illustrate the relation of a fiber 
and its termination to a respiratory bronchiole and two alveolar 
ducts which arise from the latter. The wail of the bronchiole 
