We were now in Martial N. latitude 57°, in a comparatively open part of the narrow sea which encloses the northern land-belt, and to the south-eastward lay the only channel by which this sea communicates with the main ocean of the southern hemisphere. Along this we took our course. Rather against Ergimo's advice, I insisted on remaining on the surface, as the sea was tolerably calm. Eveena, with her usual self-suppression, professed to prefer the free air, the light of the long day, and such amusement as the sight of an occasional sea-monster or shoal of fishes afforded, to the fainter light and comparative monotony of submarine travelling. Ergimo, who had in his time commanded the hunters of the Arctic Sea, was almost as completely exempt as myself from sea-sickness; but I was surprised to find that the crew disliked, and, had they ventured, would have grumbled at, the change, being so little accustomed to any long superficial voyage as to suffer like landsmen from rough weather. The difference between sailing on and below the surface is so great, both in comfort and in the kind of skill and knowledge required, that the seamen of passenger and of mercantile vessels are classes much more distinct than those of the mercantile and national marine of England, or any other maritime Power on Earth. I consented readily that, except on the rare occasions when the heavens were visible, the short night, from the fall of the evening to the dissipation of the morning mists, should be passed under water. I have said that gales are comparatively rare and the tides insignificant; but the narrow and exceedingly long channels of the Martial seas, with the influence of a Solar movement from north to south more extensive though slower than that which takes place between our Winter and Summer Solstices, produce currents, atmospheric and oceanic, and sudden squalls that often give rise to that worst of all disturbances of the surface, known as a "chopping sea." When we crossed the tropic and came fairly into the channel separating the western coast of the continent on which the Astronaut had landed from the eastern seabord of that upon whose southern coast I was presently to disembark, this disturbance was even worse than, except on peculiarly disagreeable occasions, in the Straits of Dover. After enduring this for two or three hours, I observed that Eveena had stolen from her seat beside me on the deck. Since we left Askinta her spirits had been unusually variable. She had been sometimes lively and almost excitable; more generally quiet, depressed, and silent even beyond her wont. Still, her manner and bearing were always so equable, gentle, and docile that, accustomed to the caprices of the sex on Earth, I had hardly noticed the change. I thought, however, that she was to-day nervous and somewhat pale; and as she did not return, after permitting the pilot to seek a calmer stratum at some five fathoms depth, I followed Eveena into our cabin or chamber.