This three-sentence summary provides an overview of the key elements and themes in Nathaniel Hawthorne's short story "Dr. Heidegger's Experiment": The story describes an experiment conducted by Dr. Heidegger where he has four elderly guests drink water from a mysterious vase in an attempt to regain their youth; the vase and its water represent symbolic allegorical elements and the story explores themes of the supernatural, foreshadowing, and high emotional feelings in an attempt to impart a moral lesson to the reader.