The remainder of our journey to Thark was uneventful. We were twenty days upon the road, crossing two sea bottoms and passing through or around a number of ruined cities, mostly smaller than Korad. Twice we crossed the famous Martian waterways, or canals, so-called by our earthly astronomers. When we approached these points a warrior would be sent far ahead with a powerful field glass, and if no great body of red Martian troops was in sight we would advance as close as possible with............