Die träume : medizinisch-psychologische Untersuchungen / von Sante de Sanctis ; autorisirte und durch zahlreiche Nachträge des Verfassers erweiterte Übersetzung von Dr. O. Schmidt ; nebst Einführung von Dr. P.J. Möbius.
A German medical-psychological study of dreams by Sante de Sanctis, translated by Dr. O. Schmidt with an introduction by Dr. P.J. Möbius, published in Halle by C. Marhold in 1901. Its two pictures are plain line graphs: the upper one plots thousands of centimetres against hours with two labelled curves, A a sharp early spike and B a flatter dotted line, while the lower one shows a hatched area chart over numbered hour divisions. A designer might take from them the clean scientific chart look, with hatched fills, labelled axes and simple tonal contrast.
