[Relative characteristics of the duration of embryonic development in Triturus vulgaris].

The data of Valouch et al. (1971) on tau 0 values in the smooth newt at different temperatures are presented as a curve. Using this curve, the absolute (in hours and days) duration of successive developmental stages provided by Glaesner (1925) is transformed in a relative one, expressed in the number of tau 0 (tau n/tau 0).