364 OLIVER 8. STRONG 
The inferior colliculi were asymmetrical, the left being narrower, 
more prominent and protruding further caudad, its brachium 
appearing less prominent than that of the right. 
The left superior colliculus appeared to be largely lacking. 
The same external causes which possibly operated to arrest the 
development of one side of the cerebellum might also have 
operated in this region. 
The iter narrowed funnel-like to a point at the level of the 
inferior colliculi where it had the diameter of a mere pin-prick. 
The forebrain showed an internal hydrocephaly with dilatation 
of all parts of its ventricles. 
The brain stem, with the cerebellum removed, was cut trans- 
versely into slices about 0.5 em. thick. The pieces were mordanted 
in bichromate of copper 3 per cent for 7 or 8 days and imbedded 
in clove-oil celloidin. The sections were stained inhaematoxylin 
(10 per cent solution of hematoxylin in absolute alcohol 1 vol. 
+ water 9 vols.) about 12 hours at the temperature of the room. 
They were then rinsed in water, dipped in osmie acid about + 
of 1 per cent for a fraction of a minute and decolorized by the 
Pal method.! 
The greater part of the sections was prepared by one of the 
writer’s students, C. E. Doran, who was to complete and publish 
the work. The unfortunate death of Mr. Doran just when he 
was beginning his study of the material caused the work to be 
laid aside. ' 
There are some serious gaps in the series of preparations, 
involving the connections of the cerebellum, which was removed 
before sections were made, and also in the region of the superior 
colliculi and further cephalad. Because of these the case will 
not be made the basis of a more extended study and discussion 
and the present article will be limited to a bare description of the 
peculiarities observed. Reference should be made however to 
! For further details concerning the use of copper bichromate and other experi- 
ments with the Weigert method, see the writer’s article ‘‘ Notes on the technique 
of Weigert’s method for staining medullated nerve fibers.’’? Journ. Comp. Neur., 
vol. 13, no. 4. Instead of using Pal’s oxalie acid-potassium sulphite mixture 
after the permanganate, sulphurous acid diluted with about ten volumes of water 
will answer as well or even better. 
