One pursued me to my eyrie, and swarmed up onto the ledge with me. At least such was his intention, but man is always most dangerous when cornered. I was weary of being hunted. As the frothing apish monstrosity hauled himself up over my ledge, manlike, I drove my poniard down between his shoulders with such fury that I literally pinned him to the ledge; the keen point sinking a full inch into the solid stone beneath him.

The incident showed me both the temper of my steel, and the growing quality of my own muscles. I who had been among the strongest on my own planet, found myself a weakling on primordial . Yet the potentiality of mastery was in my brain and my thews, and I was beginning to find myself.

Since survival was dependent on toughening, I toughened. My skin, burnt brown by the sun and hardened by the elements, became more impervious to both heat and cold than I had deemed possible. Muscles I had not known I possessed became evident. Such strength and suppleness became mine as Earthmen have not known for ages.

A short time before I had been transported from my native planet, a noted physical culture expert had pronounced me the most perfectly developed man on Earth. As I hardened with my fierce life on , I realized that the expert honestly had not known what physical development was. Nor had I. Had it been possible to divide my being and set opposite each other the man that expert praised, and the man I had become, the former would have seemed ridiculously soft, sluggish and clumsy in comparison to the brown, sinewy giant opposed to him.

I no longer turned blue with the cold at night, nor did the rockiest way bruise my naked feet. I could swarm up an almost sheer cliff with the ease of a monkey, I could run for hours without exhaustion; in short dashes it would have taken a racehorse to outfoot me. My wounds, untended except for washing in cold water, healed of themselves, as Nature is prone to heal the hurts of such as live close to her.