THE CERVICAL SYMPATHETIC TRUNK aaa 
ean be followed. Michailow thinks it probable that these smooth 
fibers are axons. It will be seen that these neurones resemble 
some described by Dogiel in the spinal ganglion. 
Are there special sensory dendrites in the sympathetic ganglia? 
This problem has been in the foreground ever since 1896 when 
Dogiel published his paper on ‘‘Zwei Arten sympathischer 
Nervenzellen.”” The one type of dendrite which he thought 
belonged to motor cells branched repeatedly in the neighbor- 
hood of the cell and ended within the ganglion; the other, which 
he thought belonged to sensory cells, resembled unmyelinated 
nerve fibers and could be traced long distances. Many of them 
could be followed out of the ganglion and were thought to end as 
sensory fibers in the viscera. Cajal (11) finds no evidence in 
favor of the sensory function of these long dendrites and was not 
able to find any of them leaving the ganglia and associated nerve 
trunks to end in the viscera. ; 
Carpenter and Conel (714), working with Cajal’s method on 
the superior cervical ganglion of the cat, could find cells answering 
to the description of Dogiel’s two types, but were not convinced 
that such cells represent two distinct categories, since all grada- 
tions between the two extremes were found. In Nissl prepara- 
tions all the cells of the sympathetic ganglia appeared to Carpen- 
ter and Conel to be of one type. In the cerebrospinal system 
it is easy to recognize sensory and motor cells by the arrangement 
of their chromatophile substance, but all the sympathetic gan- 
glion cells seemed to have a structure intermediate in character 
between that of the cerebrospinal sensory and motor types. 
Since these results would indicate that there is but one functional 
type of cell in these ganglia and since we know that the majority 
of the cells are motor, the probability against the presence of 
sensory cells is increased. 
So far as we have been able to find no one has confirmed Dogiel’s 
account of the sensory type of cell except Kuntz (’13), who found 
certain structures which could be interpreted in this way. Nor 
has the correlated observation of Dogiel, that fibers, arising from 
sensory cells in the sympathetic ganglia, run to end in peri- 
cellular baskets about spinal ganglion cells, been much better 
