In a reprint from the Neurologisches Centralblatt, No. 21, 1898, Dr. Paul Flechsig gives us some further investigations on the development of the fibres in the human brain. In his examinations he has used forty-eight hemispheres belonging to twenty-eight brains of all periods of early life, from the fótus of seven months to the child of fifteen months. He thus sums up the results to which he has arrived.