ISBN: 9780217954242

Robert Jameson, Paperback, English-language edition, Pub by General Books LLC Books Edinburgh-New-Philosophical-Journal-Volume-46~~Robert-Jameson General Books LLC Purchase of this book … Meer...

Robert Jameson, Paperback, English-language edition, Pub by General Books LLC Books Edinburgh-New-Philosophical-Journal-Volume-46~~Robert-Jameson General Books LLC Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: direct. Now, the inverse current in mixed nerves, is the direct in their incident portions. Ex. 16. We prepared a frog, as before, and having divided the junction between the femora, we placed the feet on separate discs of silver, and passed through them the influence of three Voltaic glasses, so that the direct current passed along: the nerves of the left extremity, and the inverse along those of the right. On completing the circle, the anterior extremities were moved; on breaking it, after four minutes, the same phenomenon was observed. This result was obtained several times. The proof that the electrogenic state may exert its influence in an incident and retrograde direction in the nervous system, may, therefore, be considered as complete, whilst new light is thrown on that system of incident nerves which has now, for many years, occupied my continued attention. III. On Primary and Superadded Voltaic Circuits. I have incidentally described the principal phenomena of the primary voltaic current passed severally along the lumbar nerves, the spinal marrow, and the incident dorsal nerves. These phenomena consist in muscular contractions, which occur when the current is effected, and which, if this current be uninterrupted, cease immediately. No author has noticed as they deserve, or as I believe at all, the extraordinary phenomena of Voltaic action in currents, superadded to the primary current. It is, therefore, to these I wish to call the attention of physiologists. I will suppose the denuded and insulated lumbar nerves to be included in a Voltaic circuit, proceeding from the " cou- ronne de tasses," or induced by the application of the Voltaic arc of zinc and silver. If now connections be made, so as to effect new or superadded circles, traceable through...<