We report a probable case of phenylketonuria in a figure from "Der Schimmel
reiter", a novella by German author Theodor Storm (1817-1888), published in
1888. The child Wienke, daughter of the story's protagonist, Hauke Haien,
displays symptoms of phenylketonuria. Storm's description of this child, it
s physiognomy, and increasing mental retardation, lead us to believe that S
torm in fact described a case of phenylketonuria, a condition not reported
until Folling's description in 1934. (C) 2001 Wiley-Liss, Inc.