The effect of the time of clumping of Locusta migratoria separated eggs on the hatching time. The differences in mean hatching times between eggs clumped and those kept with distance from one another (controls) are plotted against the time of egg clumping gauged based on the mean hatching time for the control eggs (A). SDs of the mean hatching times for the clumped eggs (closed circles) and control eggs (open circles) are similarly plotted in (B). Each datum point is based on 17–20 eggs.