Miscellanies by John Addington Symonds, M.D., selected and edited, with an introductory memoir by his son, at Archive.org.
Prichard and Symonds in especial relation to mental science : with chapters on moral insanity by D. Hack Tuke, at Archive.org.
Lectures by Dr Symonds:
Medical study : an introductory address at the Wellcome Library
Habit: Psychologically Considered at the Wellcome Library