374 OLIVER S. STRONG 
the vermis. The latter conclusion is certainly true of some of 
these and may very well be true of all. If this be accepted, we 
have on the one hand the great afferent tegmento (?)-olivo-cere- 
bellar and pallio-ponto-cerebellar paths principally to the cerebel- 
lar hemispheres which are affected greatly and on the other hand 
the afferent paths from the periphery via spino-cerebellar paths 
(whether interrupted in cord or in bulb in nuclei of posterior 
columns or arcuate and lateral reticular nuclei) to the vermis 
and from the vestibule to the vermis, which are largely or entirely 
intact. In the same way the great efferent path from the cere- 
bellar hemispheres, the dentato-rubral path is affected greatly 
while the fastigio-bulbar path, more especially from the vermis, 
is not so much involved. 
It is obvious that such a case throws no light upon the direction 
of the paths involved, i.e., whether cerebello-petal or cerebello- 
fugal, for we are not dealing with a secondary degeneration but 
with an atrophy or perhaps better an agenesia of correlated 
parts. This is well illustrated by the defects in the afferent 
and efferent paths, consisting of more than one system of neu- 
rones, to and from the left cerebellar hemisphere. 
3. Various abnormal bundles of fibers were found in parts 
of the central gray, also abnormal masses of gray in the tegmen- 
tum of the pons and aberrant pontile fibers in certain parts of 
the tegmentum. 
4. The absence of large masses of gray and of large bundles 
of fibers, such as the left superior cerebellar peduncle has caused 
in places a spatial readjustment of normal parts, exaggerating 
often the asymmetry of the two sides. 
