CRANIAL AUTONOMIC GANGLIA OF SHEEP 451 
In figure 1 the fiber marked A appears to be the neurite, in this 
instance arising from a dendrite. It may be traced through the — 
thick section in which it occurs for the distance of nearly one-half 
a millimeter from its origin. It joins a bundle of fibers lying 
along the surface of the ganglion. Throughout its length, as far 
as it can be followed, it remains non-medullated. 
Preparations of the otic ganglion stained by the Cajal silver 
nitrate method also show that the cells of this ganglion are multi- 
polar; and, moreover, that some of them are fenestrated, resem- 
bling in this respect certain ciliary ganglion cells of mammals 
and birds (Sala, -v. Lenhossék) and certain spinal ganglion cells 
of mammals (Cajal). 
The ganglion which has proved most refractory in revealing 
the character of its cells is the ciliary. Here no cells with long, 
slender processes, such as those of the other ganglia, have been 
brought to light by methylene blue in the six ganglia examined 
by this method. In most cases no processes at all are apparent, 
but occasionally a cell showing a single thick, branching, extra- 
capsular dendrite (fig. 4) has been observed. Whether such 
cells are numerous in the sheep’s ciliary ganglion, or occur sporad- 
ically only, I cannot say. It would be unsafe to make the latter 
deduction merely because a partial and capricious stain like meth- 
ylene blue shows them in comparatively few numbers. 
Schwalbe (’79, ’79 a ) described the ciliary ganglion cells of the 
sheep, studied by the isolation method, as unipolar. In other 
mammals (cat, dog, monkey) they have been shown to be multi- 
polar by Sala (’10) and Marinesco, Parhon and Goldstein (’08), 
who employed the method of Cajal. In some instances the den- 
drites extend beyond the cell capsules, in others they are short and 
intracapsular. The latter condition seems to bé the rule in the 
ciliary ganglion of man. 
It appears, then, that the autonomic cranial ganglia of the 
sheep contain cells which are allied in their morphological char- 
acters with those of the mammalian sympathetic ganglia. Both 
are characterized by long dendrites which penetrate the cell 
capsules. In the possession of these extracapsular dendrites, 
however, the cranial cells of the sheep differ from the elements of 
