Professor Stiles has been murdered, but only his skull and bones remain. He had found an ancient Inca mirror that turned people into skeletons.; What was the secret of that mysterious hotel from where the professor called the Web for help, as he fears someone will kill him.; The Applejack boys decide to build an airplane to escape from the Measle Twins.; As reporter from Hilldale Press, Ginger tries to get a statement from the visiting explorer.; Chimpy finds his new friend, Genie, in a bottle.; Banana and Stencho find a gold treasure.; Adolf the Cat is spreading fear in the forest.; After listening to an old timer's story, the boys decide to go prospecting for gold.; About ammonia, elephants, frogs and armor piercing shells.