"Croonian Lecture. On the Mammalian Nervous System. Its Functions, and Their Localisation Determined by an Electrical Method." Separate Printing from the Philosophical Transactions of the Royal Society of London, Vol. 182, B, 1891, pp. 267-526 + plates 29-35. PRESENTATION COPY.

Contemporary cloth, with original front wrapper of separate printing bound in. Wrapper soiled, and vertical edge chipped. Upper corner of rear cover bumped, else Very Good. First Edition. PRESENTATION COPY (inscribed on front wrapper): "Presented by the authors". There is also an ink stamp on p. 267: "Library of the British Medical Association, Presented by the Author." Garrison-Morton 1420.1: "Gotch and Horsley showed that electric currents are produced in the mammalian brain, and they recorded them with the string galvanometer of the capillary electrometer. Their work led eventually to the development of the electroencephalograph." For an alternative interpretation, see Brazier, p. 61.