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lomotor areas, we meet with an intermixture of the elements typical of 
the two regions. The coarse, heavily medullated fibers of the third nerve 
mingle with the slender fibers from the trigeminus, and calyx endings 
lie side by side with end nets. Still farther caudal the predominance of 
heavy oculomotor neurites and their characteristic endings becomes marked. 
I am not, however, prepared to say positively that the oculomotor 
fibers never end in true nets or baskets around the ciliary ganglion 
cells. Here and there in the oculomotor region one can make out an 
occasional end net, especially near the surface of the ganglion. But 
I have never been able to see, in my sections, a connection between 
one of these and an oculomotor neurite. Whenever the conditions have 
permitted me to observe the fibers giving origin to the end nets, 
these have proved to be of the fine, scantily medullated, trigeminal 
variety, and not in the least like the heavy, conspicuous, oculomotor 
fibers, so easily traceable into calyx endings. The truth of the matter 
may be that a few of the slender fibers of the long root stray from the 
trigeminal region proper into adjacent, and, peripherally, even into dis- 
tant portions of the ganglion, to end there in typical pericellular plexuses. 
v. Lenhossék (:11), while admitting that at first glance these 
endings appear to be essentially different from those previously described, 
declines to consider them as belonging to a special category. Since he 
does not recognize a radix longa from the trigeminus, he looks upon 
them as oculomotor endings, although his figures show a striking differ- 
ence in size between the fibers giving size to the nets and those heavy 
neurites of the third nerve which terminate in other ways. In support 
of his view he states that intermediate stages exist between this form 
and the arborescent type (v. Lenhossék’s ,polares Geflecht’’). This 
observation I cannot verify in my preparations. The pericellular plexuses 
are, according to his account, already present in a 21-day chick around 
cells arranged in groups, especially in the peripheral parts of the ganglion. 
They therefore appear to be quite as primitive forms as the calyx (,,gabel- 
formig’’) endings, which are also present at this time, and which he 
regards as developmental stages in the growth of the more complicated 
types. 
Ganglion Cellsfrom Teased Preparations. The first descrip- 
tions of the cilary ganglion cells of the hen were based on teased pre- 
parations made after the ganglionic tissues had been allowed to undergo 
slight maceration. Retzius (’80) described these cells as bipolar, both 
processes being medullated and arising near together. Holtzmann 
(96) confirmed the observations of Retzius, although be obtained many 
unipolar cells in Golgi preparations made from young chicks. The writer 
(Carpenter, :06) also described the ciliary cells as bipolar after studying 
