On the reflex electrical effects in mixed nerve and in the anterior and posterior roots

The following experiments were made during the months of May, June, and July, 1897, in the Physiological Laboratory of Leipzig, under the guidance of Professors Hering and v. Frey, to test whether in the frog, reflex electrical changes could be demonstrated at the central end— I. Of a mixed nerve. II. Of anterior roots alone. III. Of posterior roots alone. As regards the first two heads, the end in view was simply the actual verification of an extremely probable phenomenon, preparatory to an examination of the third head, viz., reflex electrical effects propagated down the posterior roots, which, in 1891, were pointed out by Gotch and Horsley, and offered as proof of the passage of centrifugal nerve impulses in normally afferent nerve channels.