Page:The Harveian oration, 1873.djvu/52

much as the recurrent laryngeal nerve does. That other vascular regions receive their vaso-motor supply by this apparently circuitous and, till the history of development is taken into consideration, paradoxical route, is from time to time being demonstrated. Dr. Pavy, to whom I have already referred, many years ago identified and mapped out one segment of the road along which nerveforce passes to the liver and prevents or allows the occurrence of diabetes. Further exploration of this route we owe to Cyon and Aladoff (Bulletin de l'Académie Impériale des Sciences de St. Petersburg, tom, xvi, p. 307; British Medical Journal, December 23, 1871); and this same investigator, working still in the same line of investigation, as it is in these days usually necessary for an investigator to work if he will make himself a name as a discoverer, has also shown us (Ludwig's Arbeiten, 3rd year, 1868) the track along which the vasomotor nerves of the anterior limbs pass, proving that these nerves pass down in the spinal cord as low as the mid-dorsal region before leaving it to turn upwards in