The Chinese, of still more ancient date, so their traditions affirm, discovered a mountain rising out of the sea possessing an intensity of attraction so great that the nails and iron bands were drawn out of their ships, causing their immediate wreck. Those sea-arabs whom we call Phoenicians had, at a very early date, made use of their knowledge of the property of the loadstone to turn towards the North Pole; though, like many other discoveries, as I have just mentioned, it was kept a profound secret among a select few, and concealed from the public by having an air of religious mystery thrown over it. Lumps of loadstone formed into balls were preserved in their temples, and looked upon with awe, as possessing mystic properties. With these round stones the point of a needle was rubbed, as often as it required fresh magnetising. I have already described the compass used by the Phoenicians, and how, long after Islamism had gained the ascendency, it was possessed by their descendants. At length the secret was divulged, and it came into general use among the mariners of the Mediterranean in the tenth and eleventh centuries. Its original form was unaltered for nearly four centuries, when, in 1502, Flavio Gioja of Positano, near the town of Amalfi, on the coast of Calabria, a place celebrated for its maritime enterprise, improved upon the primitive rude and simple instrument by suspending the needle on a centre, and enclosing it in a box. The advantages of his invention were so great that his instrument was universally adopted, and hence he gained the credit of being the inventor of the mariner's compass, of which he was only the improver.