154 J. B. JOHNSTON, 
difficulty presented by the large tractus strio-thalamici, among which 
these fibres must run, I have no doubt that- a large part of the 
olfactory tract fibres find endings in the nucleus taeniae. The dif- 
ficulty of studying the destination of these fibres is enormously in- 
creased by their diffuse arrangement. It will probably be impossible 
to determine with certainty whether they reach the nucleus taeniae 
without recourse to the degeneration method. 
EA 
In my preliminary communication I stated that I had been un- 
able to trace any fibres between the olfactory lobe and the anterior 
commissure (98a, p. 238). Since writing that paper I have secured 
a perfect series of horizontal sections which show an enormous 
number of fibres from the olfactory lobe to the anterior commissure. 
Indeed, these fibres are so numerous that in this series they seem 
to form the greater part of the commissure. A small part of the 
crossing fibres are situated farther cephalad, separated from the main 
body of the commissure by a depression of the floor of the ventricle, 
