This paper is to report the findings of a somewhat extended attempt to transplant cerebral cortex. In two instances, a t least, the attempt to keep alive the neurons within the tissue seemed to meet with success, although not in the manner desired, since the tissue transferred from one animal to a second animal became adherent in a position such that the extending axons could not grow into adjacent nervous tissue. The secondary findings have some interest also, and the entire problem has a value because of its bearing on the question of the vitality of nervous tissues. Continuation of the life and growth of nervous tissue in vitro has been accomplished successfully, Harrison, '07, Burrows, '1 1, Lewis, '12, but the perpetuation of the vitality of n~rvous tissue transferred from one region of the nervous system to another region has met with greater difficulties. In the earlier attempts at transplantation it was found that the transplanted mass did not disintegrate entirely and disappear, but that the neurons died, leaving the supporting structures to represent the original transplanted portion. Of the earlier attempts at transplantation those of W. Gilman Thompson, '90, of Saltykow, '05, and of Del Conte, '07, may be cited. In
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