Instructions: Enter the harvesting function in the text box. You may enter either a function of p (e.g. .05*p) or a constant (e.g. 100). After entering the harvesting function, press the Enter key to draw the graph of population vs. time with this harvesting function. The most recent graph will be drawn in yellow while previous graphs will appear in green. When the window becomes too crowded with graphs, press the Clear Graph button to erase all but the most recent graph.