118 O. LARSELL 
were the ganglionic cells of the sensory fibers which supply the 
two lobes of the lung in question. . 
Similar results had previously been obtained in the dog by 
Ikegami and Yagita (’07), also by experimental methods. They 
concluded that from about 12 per cent to 13 per cent (1/8.3 to 
1/7.5) of the total number of cells of the right nodose ganglion 
are in connection, in the dog, with the pulmonary parenchyma. 
Chase and Ranson (714), who studied the finer structure of 
the vagus nerve in the dog, cat, rabbit, rat, and human, state 
that the bronchial rami of the vagus contain large numbers of 
myelinated fibers and take from the vagus a considerable propor- 
tion of the myelinated fibers which have continued in it down to 
this level. They do not make any specific statement as to the 
size of the myelinated fibers in the bronchial rami of the vagus, 
but in a preceding paragraph they state that this nerve, just 
above its pulmonary branches, contains a few myelinated fibers 
of large size, although the majority are of small or medium size. 
Below the pulmonary rami of the vagus nerve relatively few 
myelinated fibers are present. 
The results of these various investigators indicate that periph- 
eral fibers from cells in the ganglion nodosum pass by way of 
the vagus nerve and its pulmonary rami into the lung. It 
appears reasonable to assume that the sensory terminations 
above described are the terminal processes of these fibers. 
In addition to the sensory terminations in the bronchial tree, 
the writer is able to confirm the observations of Schemetkin, 
reported by Dogiel (’98), that there are sensory terminations in 
the walls of the pulmonary artery. So far as the writer has 
observed, these are found only near the base of this artery, 
close to the hilum of the lung. 
MOTOR TERMINATIONS 
Motor terminations are found in the rabbit’s lung, both in 
the smooth muscle of the bronchial tree and in the muscular 
coat of the pulmonary vessels. 
