OF DENISON UNIVERSITY. 
8i 
The superficial tract of the olfactory fibres passes along the ven- 
tral surface in ill-defined bundles to the hippocampal region. Here 
small, dark, angular, multipolar cells abound, similar to those of the 
anterior or fornix eminentia of the thalamus. The relation of the 
hippocampus with the fornix has already been indicated. It is proba- 
ble that fibres from the hippocampus pass to the higher cortical regions 
via the fornix commissure, just as in the reptilia. It is not impossible 
that there is a connection of the central tract with the hippocampus, 
but such a communication was not demonstrated. 
Other fibres seem to depart from the main tracts and gather at the 
anterior commissure. The anterior'commissure in the brain of the rat 
was studied for comparison with the result of confirming the suggest- 
ions already made. 
The transverse sections have thrown no light on the course of the 
fibres from the dorsal nucleus of the thalamus {taena thalami), which 
in horizontal sections are found to pass ventrad along the cephalic bor- 
der of the thalamus, behind the callosum and anterior commissure, to 
the point of entrance of the pyramidal fibres into the hemisphere. 
We think it probable that these fibres make their way to the hippo- 
campal or occipital region of the cortex. 
The Prosencephalon. 
(It will be convenient in presenting the few notes we at present 
offer upon the fore-brain, to reverse the order hitherto followed.) 
{a.) The olfactory lobes are of considerable size and are connect- 
ed with the cerebral hemispheres by a relatively thick crus olfactorius. 
The form of the bulb proper is ovoid and it is obliquely appressed 
upon the front of the hemisphere. 
Microscopically the structure is not unlike that of the human sub- 
ject. The outermost layer consists of bundles of olfactory nerves 
passing in various directions to unite with the glomerular layer. The 
exact method of emergence was not observed. The so-called glom- 
erular layer is simply a belt of fibre bundles, each bundle being sur- 
rounded by a cluster of neurilema nuclei.” The olfactory fibres are 
more or less convoluted and are separated by a dense reticulum of 
neuroglia. The glomerular layer insensibly passes into the more hom- 
ogeneous but otherwise similar gelatinous layer. Here the olfactory 
fibres pass through a dense net-work of connective tissue with sparse • 
neuroglia nuclei. Forming the inner boundary of the gelatinous layer 
