The Origin of Continents and Oceans roughly the time when the

roughly the time when the spritsail topmast was superseded by the jib boom and other innovations of eighteenth-century rigging

the book provides not only an overview of naval tactics

and "right and wrong

(Although excluded from public

cast in the form of letters to a student

The Origin of Continents and Oceans roughly the time when theSince its inception modern geology has been faced with an important group of problems: explaining parallel formations that are separated by great distances of sea; accounting for isolated life forms in widely separated areas (such as lemurs in Madagascar and India); explaining pre pleistocene glaciations, and similar problems. The usual explanation has been to assume the one time existence of land bridges (such as the hypothetical Lemuria) or