The effect of the time of separation of paired Locusta migratoria eggs on the hatching time. The differences in mean hatching times between eggs separated and those kept in contact with each other (controls) are plotted against the time of egg separation gauged based on the mean hatching time for the control eggs (A). Comparison of SDs of the mean hatching times (B) and the intervals of hatching in each pair (C) for the eggs separated (open circles) and the control eggs (closed circles). Each datum point is based on 14–24 eggs.