The document discusses similarities between two famous works of fiction featuring mad scientists: The Strange Case of Dr. Jekyll and Mr. Hyde and The Island of Doctor Moreau. Both works criticize scientists who go too far in their experiments and hurt living beings. They also explore themes of man's inner monster and the connection between humans and evolution. While Jekyll and Hyde focuses on one scientist's personal ruin, Doctor Moreau features a scientist who ruins the lives of many animals and men through vivisection experiments.