1. R. J. A.Berry: “Brain Size and Mentality” The British Medical Journal July 11 1936.
2. J. H.Biggart: “Pathology of the Nervous System” 1936 page12.
3. Cunningham: “Text‐Book of Anatomy” Fourth Edition 1920 page503.
4. P.Flechsig:“Anatomie des Menschlichen Gehirns und Rückenmarks” 1920.
5. Is myelinogeny an absolute index of behavioral capability?