Bomba lived with an old naturalist, Cody Casson, in the depths of the Amazonian jungle, so remote from civilization that it was rarely if ever visited by white men. Of his past he knew nothing, and so far Casson had told him next to nothing. He had given the boy some rudiments of education, especially in his own line of botany and natural history, but even this teaching had ceased years before when the old naturalist’s mind had been weakened by the exploding rifle.