The narrator, troubled by recurring, vivid dreams, gradually recognizes them as ancestral memories from a distant evolutionary past. Through nocturnal visions and waking reflections a prehistoric world emerges: dense forests, predator-prey struggles, seasonal camps, and social groupings whose customs and rivalries shape behavior. The narrative shifts between personal memory and speculative natural history to examine instincts, inherited traits, and the persistence of primitive urges in modern consciousness. Interwoven scenes of fear, hunting, and communal life prompt philosophical reflections on human origins, survival, and the biological continuities linking present humanity to earlier forms.