内容简介：
It is the duty and ought to be the pleasure of age and experience to warn and instruct youth and to come to the aid of inexperience. When sailors have discovered rocks or breakers and have had the good luck to escape with life from amidst them they unless they be pirates or barbarians as well as sailors point out the spots for the placing of buoys and of lights in order that others may not be exposed to the danger which they have so narrowly escaped.