"That's a complicated question," said the doctor. "In answer to that we must leave ascertained facts and trust to theories, unless, indeed, we accept as valid the statements of this remarkable manuscript. For my own part, I see no reason why it should not be as More says. Remember, this polar world is thirteen miles nearer to the centre of the earth. Whether this should affect the climate or not, depends upon the nature of the earth's interior. That interior, according to the popular theory of the present day is a mass of fire. This theory affirms that the earth was once a red-hot mass, which has cooled down; but the cooling process has only taken place on the surface, leaving the interior still a molten mass of matter in a state of intense heat and combustion. At the poles the surface is thus thirteen miles nearer to these tremendous fires. Of course it may be supposed that the earth's crust is of about equal thickness on all parts; yet still, even if this be so, thirteen miles ought to make some difference. Now at the North Pole there seem to be causes at work to counterbalance the effect of the internal heat, chiefly in the enormous accumulation of polar ice which probably hems it in on every side; and though many believe in an open polar sea of warm water at the North Pole, yet still the effect of vast ice-masses and of cold submarine currents must be to render the climate severe. But at the South Pole it is different. The observations of Ross and of More show us that there is a chain of mountains of immense height, which seem to encircle the pole. If this be so, and I see no reason to disbelieve it, then the ice of the outer seas must be kept away altogether from that strange inner sea of which More speaks. Ross saw the volcanoes Erebus and Terror; More saw two others. How many more there may be it is impossible to say; but all this shows that the effect of the earth's internal fires is very manifest in that region, and More has penetrated to a secluded world, which lies apart by itself, free from the influence of ice-masses, left to feel the effect of the internal fires, and possessing what is virtually a tropical climate." "Well," said Melick, "there is no theory however wild and fantastic, which some man of science will not be ready to support and to fortify by endless arguments, all of the most plausible kind. For my own part, I still believe More and his south polar world to be no more authentic than Sindbad the Sailor." But the others evidently sympathized with the doctor's view, and regarded Melick as carrying his scepticism to an absurd excess. "How large do you suppose this south polar ocean to be?" asked Featherstone.