A short natural-history article on the Polyphemus moth (Telea polyphemus), sometimes called the American silk-worm moth. The author describes rearing it in captivity: egg laying, caterpillar feeding and growth, cocoon spinning, emergence of the moth, and natural enemies. It ends by noting that the cocoon thread is strong and brilliant but coarser than Chinese silk, and that labor costs prevent commercial silk production in America.