P. 590, line 16

The expression $f(x(t)+c_{2}f(x(t),t)\mathrm{\Delta }t,t+c_4\mathrm{\Delta }t)$ should be

$f(x(t)+c_{3}f(x(t),t)\mathrm{\Delta }t,t+c_4\mathrm{\Delta }t)$

Return to errata.