It actually touched Earth at night. There was no rocket-drive to call attention and by dawn it was well-concealed. Only one living creature had seen it land--a mountain-lion. Even so, by midday the skeleton of the lion was picked clean by buzzards, with ants tidying up after them. And the Qul-En in the ship was enormously pleased. The carcass, before being abandoned to the buzzards, had been studied with an incredible competence. The lion's nervous system--particularly the mass of tissue in the skull--unquestionably contained either the desired hormone itself, or something so close to it that it could be modified and the hormone produced. It remained only to discover how large a supply of the precious material could be found on earth. It was not feasible to destroy a group of animals--say, of the local civilized race--and examine their bodies, because the hormone would be broken down by the weapon which allowed of a search for it. So an estimate of available sources would have to be made by sampling. The Qul-En in the ship prepared to take samples. The ship had landed in tumbled country some forty miles south of Ensenada Springs, national forest territory, on which grazing-rights were allotted to sheep-ranchers after illimitable red tape. Within ten miles of the hidden ship there were rabbits, birds, deer, coyotes, a lobo wolf or two, assorted chipmunks, field-mice, perhaps as many as three or four mountain-lions, one flock of two thousand sheep, one man, and one dog. The man was Antonio Menendez. He was ancient, unwashed, and ignorant, and the official shepherd of the sheep. The dog was Salazar, of dubious ancestry but sound worth, who actually took care of the sheep and knew it; he was scarred from battles done in their defense. He was unweariedly solicitous of the wooly half-wits in his charge. There were whole hours when he could not find time to scratch himself, because of his duties. He was reasonably fond of Antonio, but knew that the man did not really understand sheep. Besides these creatures, among whom the Qul-En expected to find its samples, there were insects. These, however, the tiny alien being disregarded. It would not be practical to get any great quantity of the substance it sought from such small organisms.