the zürich tax records ("zürcher steuerbücher") of 1470 only contains a record of the manor of weiach. at the time, the village comprised 16 households, with 48 inhabitants over the age of 15 liable to pay tax. between 1634 and 1760, having been requested to do so by the zürich authorities, the priests kept detailed records of population size, albeit with sporadic intervals. later figures have been taken from the following sources: 1790 werdmüller's memorabilia tigurina, 1799 priests' inquiry of the helvetian government, 1820 erni's memorabilia tigurina, 1827 lutz's "vollständige beschreibung des schweizerlandes". the figure for 1836 is based on the zürich cantonal census. figures from 1850 onwards have been taken from the confederational census. (the criteria for recording population data have changed considerably over the centuries. each interpretation can cause the figures to vary considerably. the figures are taken from different sources. for the years 1710 to 1820, data are hardly available.)