Magnetic Stone The Rupes Nigra (“Black Rock“)

Tides In the midst of the four countries is a Whirl-pool, this is what makes tides not the Moon into which there empty these four indrawing Seas which divide the North. And the water rushes round and descends into the Earth just as if one were pouring it through a filter funnel. It is four degrees wide on every side of the Pole, that is to say eight degrees altogether. Except that right under the Pole there lies a bare Rock in the midst of the Sea. Its circumference is almost 33 French miles, and it is all of magnetic Stone The Rupes Nigra (“Black Rock“)