THE work, of which the following is an account, was begun in 1887 at the suggestion of Dr Foster and Dr Gaskell, and to them my best thanks are due for much valuable advice and assistance on many occasions. It seemed desirable, in the light of Gaskell's' well-known work on the sympathetic system, to attempt to map out the origin, course and nature of the renal nerves more accurately than bad hitherto been attempted. More particularly it was important to decide whether the vascular nerves were of two kinds, vaso-constrictor and vaso-dilator, or whether the latter nerves couild not be demonstrated to exist. The research was carried out exclusively on dogs, inasmuch as this was the animal used by Gaskell in his anatomical researches on the sympa
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