Paper, 'On the structure and functional significance of the human corpus callosum' by D J [David James] Hamilton Hamilton writes: 'The results have been obtained by a special mode of preparation formerly described by me [...] The fibres in the tip of the frontal lobe run almost directly backwards. A short way behind this they become concentrated in an oval shaped area. This oval shaped area still further back divides into three distinct bundles, and these bundles I have named the tractus internus, tractus medius, and tractus externus.' Annotations in pencil and ink. Subject: Neuroscience / Physiology Received 23 January 1884 / 23 February 1884. Read 28 February 1884. Communicated by [Thomas Henry] Huxley. A version of this paper was published in volume 36 of the Proceedings of the Royal Society as 'On the structure and functional significance of the human corpus callosum'. 1884