Mason let the surveyor rod down with a crash. I could see the anger and resentment that was gathering in his eyes. Mason was the youngest of our party and the leader of the antagonistic group that was slowly but steadily undermining the authority of the Navigator. This was our seventh exploratory trip after our sixth landing since entering the field of the sun Ponthis. Ponthis with its sixteen equal-sized planets, each with a single satellite. First there had been Coulora; then in swift succession, Jama, Tenethon, Mokrell, and R-9. And now Stragella. Strange names of strange worlds, revolving about a strange star. It was Navigator Norris who told us the names of these planets and traced their positions on a chart for us. He alone of our group was familiar with astrogation and cosmography. He alone had sailed the spaceways in the days before the automatic pilots were installed and locked and sealed on every ship. A handsome man in his fortieth year, he stood six feet three with broad shoulders and a powerful frame. His eyes were the eyes of a scholar, dreamy yet alive with depth and penetration. I had never seen him lose his temper, and he governed our company with an iron hand. He was not perfect, of course. Like all Earthmen, he had his faults. Months before he had joined with that famed Martian scientist, Ganeth-Klae, to invent that all-use material, _Indurate_, the formula for which had been stolen and which therefore had never appeared on the commercial market. Norris would talk about that for hours. If you inadvertently started him on the subject a queer glint would enter his eyes, and he would dig around in his pocket for a chunk of the black substance. "Did I ever show you a piece of this?" he would say. "Look at it carefully. Notice the smooth grainless texture--hard and yet not brittle. You wouldn't think that it was formed in a gaseous state, then changed to a liquid and finally to a clay-like material that could be worked with ease. A thousand years after your body has returned to dust, that piece of _Indurate_ will still exist, unchanged, unworn. Erosion will have little effect upon it. Beside it granite, steel are nothing. If only I had the formula ..." But he had only half the formula, the half he himself had developed. The other part was locked in the brain of Ganeth-Klae, and Ganeth-Klae had disappeared. What had become of him was a mystery. Norris perhaps had felt the loss more than any one, and he had offered the major part of his savings as a reward for information leading to the scientist's whereabouts. Our party--eighteen couples and Navigator Norris--had gathered together and subsequently left Earth in answer to a curious advertisement that had appeared in the Sunday edition of the London _Times_. WANTED: _A group of married men and women, young, courageous, educated, tired of political and social restrictions, interested in extra-terrestrial colonization. Financial resources no qualification._