Dr. Goltz, at the meeting of neurologists and alienist physicians in Baden, held in June, 1880 (“Archiv.,” xi. Band, 1 Heft), described a new series of experiments in order to ascertain the functions of the cortex cerebri. By the help of an instrument specially made for the purpose, he removed portions of the pia mater of the brain in animals. Even after removing a large portion of the cortex cerebri he never saw enduring paralysis of any muscle, nor enduring anaesthesia of one side of the body. The animals became demented, and showed permanent dulness of all the senses. What is especially remarkable, Goltz, by destroying the white substance under the so-called motor zone, could produce convulsions in the opposite side; but as long as the instrument only touched the grey matter there were no convulsions. Mechanical irritation of the parts was followed by the same results. Dr. Goltz therefore believes that, in electrical irritation of the brain as practised by Fritsch and Hitzig, we have not to do with irritation of the grey matter, but of the underlying white substance.
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