Whether the common sense resides, as Willis would have it, in the two tiny bodies that he calls corpora striata, while the sinuosities of the brain preserve the species of the memory and the corpus callosum is the seat of the imagination; or whether, following the opinion of Femel, in the pia mater, which encloses the substance ofthe brain; whether it be in the pin al gland of Descartes; or finally in some other portion hitherto unknown, that our soul exercises its principal functions, does not trouble us much here.