A Quantitative Study of Mitosis inEudorina elegansin Culture

Abstract

A list of the determinations in this work is given below: 1. Under standard conditions with a photoperiod, the generation time is five days. The generation time is shorter in continuous light. 2. There are temperature-dependent cleavage and mitotic gradients within a colony. 3. A diurnal peak of mitosis occurs two hours before the onset of darkness. 4. Under standard conditions (a) the mitotic index rises to a maximum of 10 per cent, two days after inoculation ; (b) the mitotic time is ten minutes ; and (c) the mitotic rate is 71 cells per io3 cells per hour at the mitotic peak.