Rocky Lane's Black Jack #21

Rocky Lane must rescue his horse Black Jack from a villain named Morton, who has poisoned the animal and plans to prevent Black Jack from returning by keeping him drugged with evil liquids at his shack. Rocky rides out to retrieve his horse despite warnings that wild horses in the area won't let anyone approach, and he encounters Black Jack, who has been abused and filled with hatred for mankind. After a struggle, Rocky manages to cage Black Jack like a mad wolf to contain him. The issue includes an educational feature on "The Mail Gets Through," detailing the history of the Pony Express and early mail delivery services.