Fig. III Sakulare Schwankungen der temperatur, In wie weit ist das heutige klima konstant, Eduard Bruckner, p109 Verhandlungen des VIII, Deutschen Geographentages, Berlin, 1889. “Rainfall is not the only meteorological element displaying this kind of rhythmic varisation. Similar ones have been identified for temperature in a two-fold approach: one based on records about the length of time of the river’s ice cover during winter and the other based on temperature measurements. The following chart, figure 3, will illustrate the temperature variations. The resulting curve is based on [5 year] averages of the mean values reported by Koppen and determined by those stations in Europe and New England which carried out observations even prior to 1820.[temperature is in degrees celsius]” Translation Stehr and Gamlin in Stehr and von Storch, 2000.