xl Journal of Comparative Neurology. 



the formatio bulbaris which " results from the union of the olfactory 

 nerve fibres with the processes of the ganglion cells." We have de- 

 voted so much space to this structure and its relation to the sheath for- 

 mation and method of termination that it is with some surprise that we 

 note the meagerness of detail and reserve as to well authenticated 

 results. 



We do not gather exactly what is meant by the lobus olfactorius — 

 in figure 5, it would seem to be the pes bulbi, but the description seems 

 to make it plain that the frontal protuberance of the cerebrum forming 

 the support of the bulb is intended. The tractus cortico-cpistriaticus 

 consists of fibres rising in the lobus near the termini of the radiatio. 

 From the area olfactoria arises the tractus olfactorius septi which Edinger 

 identifies as our radix medialis. It terminates in the cortex of the 

 hippocampal region — "Ammonsrinde." The term " area olfactoria" is 

 applied to an enormous extent and is divided into the mdulus occipitalis, 

 tuber thicnicc (pyriform lobe) as well as the post-rhinal lobe, to which it 

 would seem to directly apply. The various bundles connecting with the 

 thalamus are all included in the th;ienia thalami, including tractus olfac- 

 to-habenularis and tractus cortico-habcnulans . It seems to the reviewer 

 doubtful whether we are at present justified in referring all these fibres, 

 with no more to do, to the olfactory apparatus. 



If we understand correctly, Dr. Edinger accepts the suggestion 

 that the epistriatum is an invaginated cortical area. It is to be regretted 

 that some comparisons were not made with the basal lobe of birds as 

 described by Turner, who made out, similar divisions and even found 

 an invaginated cortex in somewhat similar relations. 



We are glad to note that the author has so far modified his earlier 

 views as to recognize the probable existence of a tract connecting the 

 optic centres with the cortex, " Sehstrahlung aus den Opticuscentren 

 zur Rinde." 



Thus the earlier position that the cortex of reptiles is wholly given 

 up to the olfactory function and its associations is somewhat modified 

 but appears in the following form : " Nur lasst sich sicher bestimmen, 

 dass der grosste Teil der Reptilienrinde mit dem Riechapparat 

 Zusammenhangt." 



It is indeed a most creditable achievement to have called attention 

 to the psychogenetic significance of the preponderating position among 

 the cortical stations held by those of smell, but we respectfully repeat 

 our statement, made on several earlier occasions, that it is not correct 

 to attribute an exclusively osmatic tone to the cerebral activities of the 

 Sauropsida or even the Ichthyopsida. The vast complexity of cortical 



