718 General Notes. [ November, 
respective functions of the different olfactory centers. 5. Con- 
clusions relative to the olfactory centers of man. Of this last- 
named section we give a translation in full: “It is man who 
forms the objective point of our study; the facts of compara- 
tive anatomy which we have just set forth would not have 
deserved so much discussion if they did not converge toward this 
point. It will not, therefore, be profitless to review, in conclu- 
sion, the notions which comparative anatomy permits us to add 
to the anatomy and the physiology of the brain of man. 
1. The external olfactory root (racine) traverses the Silvian fis- 
sure and extends to the upper part of the hippocampus. It really 
originates in the cortex of this lobe. 
2. The internal olfactory root proceeds to the intersection of 
the hemisphere and loses itself in the origin of the convolution of 
gray layer of the perforated space, but it is made up, like the 
two other roots, of white fibres, which, after an extremely short 
passage (/rajet), returns to the posterior edge of the two first 
orbital convolutions. 
ere exists in the mantle of the hemisphere three distinct 
olfactory centers, corresponding to the three olfactory roots. _ 
_ 5. The anterior olfactory center embraces the posterior portion 
of the two first orbital convolutions. It commences posteriorly 
upon the anterior edge of the perforated space, and extends, from 
rear to front, over the second orbital convolution to the level of 
the fissure in the hippocampus. Upon the first orbital convolution 
its anterior limit is not indicated anatomically ; but it is probable 
that it corresponds tothe same horizon. From the mean position 
of the fissure in hippocampus, or of the depression which repre- 
sents it, we may say that the orbital olfactory center comprises, 
on an average, the posterior third of the two first orbital con- 
volutions, i 
6. The posterior olfactory center occupies the lobe of the hippo- 
campus, which forms about the anterior third of the convolution 
of the hippocampus: a transverse line carried through the ex- 
face of the hemisphere. It embraces the intersection (carrefour) 
corporis callosi, the position of this pli de passage when it is 
‘ofound,” on a l 
