sea. But here a difference is perceptible. The material ocean has been so far mastered by the wisdom and the heroism of man that we may look for a time to come when the mystery shall be manifest of its furthest north and south, and men resolve the secret of the uttermost parts of the sea: the poles also may find their Columbus. But the limits of that other ocean, the laws of its tides, the motive of its forces, the mystery of its unity and the secret of its change, no seafarer of us all may ever think thoroughly to know. No wind-gauge will help us to the science of its storms, no lead-line sound for us the depth of its divine and terrible serenity.
As, however, each generation for some two centuries now or more has witnessed fresh attempts at pilotage and fresh expeditions of discovery undertaken in the seas of Shakespeare, it may be well to study a little the laws of navigation in such waters as these, and look well to compass and rudder before we accept the guidance of a strange helmsman or make proffer for trial of our own. There are shoals and quicksands on which many a seafarer has run his craft aground in time past, and others of more special peril to adventurers of the present day. The chances of shipwreck vary in a certain degree with each new change of vessel and
