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Fig. 31 Two portions from the section drawn in figure 29 to show the modifi- 
cation of the structure of the olfactory formation due to the presence of glomeruli. 
The part of the section drawn in a and b respectively is indicated by the same 
letter in figure 29. Where glomeruli are present the granule cell layer is con- 
siderably thicker and more dense and the layer of large mitral cells is added. 
Magnification 110 diameters. 
Fig. 32 Transverse section at the level of the commissures. From Johnston 
’13b, fig. 17. The right side of the drawing was taken from a section adjacent 
to that from which figure 18 of the present paper was drawn. The left side was 
drawn from a Weigert series. The crus shows the two chief bundles described in 
the text. To what extent the fascicles of the two bundles intermingle as they are 
distributed to the pallium and the ventricular lobe it is impossible to say from 
sections of normal brains. The relation of the anterior commissure to theinter- 
nal capsule is better shown in figure 48. Medial to the crus appear two other 
bundles. The darker one is the medial forebrain bundle, the lighter is the olfac- 
tory projection tract. 
Fig. 33 A section similar to the last, taken at the level of the stria medullaris. 
From Johnston ’13b, fig. 18. The two bundles of the crus are separated by a 
notch medially. The medial forebrain bundle is ventral to the olfactory projec- 
tion tract and in contact with the postoptic decussation. The lower part of the 
fiber area beneath the letters c.7., belongs to the olfactory projection tract. 
The stria medullaris is more superficial. 
448 
