She S. WALTER RANSON 
in the neck as it is below the level of the thoracoabdominal 
ganglion. No change has taken place in the proportion of mye- 
linated and unmyelinated fibers. This speaks against the pos- 
sibility of myelinated fibers losing their sheaths during their 
course and thus becoming unmyelinated fibers. It would also 
indicate that the thoracoabdominal ganglion was in no part 
sympathetic. But we will take up these points in another place. 
The recurrent nerve is given off just before the vagus breaks 
up into pulmonary gastric and cardiac branches. It is a well 
myelinated nerve consisting chiefly of small and medium sized 
myelinated fibers with a few large myelinated ones and some 
unmyelinated axons. The pulmonary rami contain a slightly 
larger proportion of the myelinated fibers than do the gastric 
rami. Most of the larger myelinated fibers in the vagus below 
the recurrent nerve enter the pulmonary rami. Both the 
pulmonary and gastric rami are rich in unmyelinated fibers. 
The cardiac rami could not be identified in the sections. 
4. The ganglia in the vagus nerve. The cervical ganglion of 
the vagus is associated exclusively with the cervical ramus as 
is shown by a study of serial sections through the vagus from 
which figure 1 was reconstructed. The ganglion was found in 
the same position in two other series. In still other series the 
ganglion was found higher up on the undivided trunk, but we 
may assume that in these cases also the cells were associated 
only with fibers destined for the cervical ramus. The inferior 
ganglion is associated only with the fibers which enter the thorax. 
These two ganglia are not strictly homologous to the jugular 
and nodose ganglia of mammals. According to Molhant (’13) 
the nodose ganglion contains most of the cells of origin of the 
sensory fibers to the larynx, and all of those of the sensory fibers 
to the esophagus, trachea, heart, lungs and stomach. The 
thoracoabdominal ganglion of the turtle differs from the nodose 
ganglion of mammals in that none of its cells are associated with 
laryngeal fibers. In other words, the mammalian nodose gan- 
glion corresponds to the thoracoabdominal and part of the cervi- 
eal ganglion of the turtle. 
Almost all the cells, especially in the cervical ganglion, possess 
protoplasmic processes ending in end bulbs. Some are very 
