Long before the Lassen Peak eruptions of 1914-15 there were reports of other volcanic activity in the region. It was said that Cinder Cone, ten miles east of Mount Lassen, had erupted during the winter of 1850-51.
These purported eruptions caught the attention of San Francisco physician Harvey W. Harkness, who had a keen interest in scientific matters. In the summer of 1874, he visited Plumas County. While there he heard the story of a recent volcanic eruption located in a far northern portion of the county known as Cinder Cone. Since he was already in the territory, he decided to examine Cinder Cone. In the fall Harkness addressed the California Academy of Sciences and told of his observations. He informed the Academy that the eruption there was indeed of recent origin. After his presentation, he came in contact with four men who had seen the eruptions from afar. One of these men was Oliver Wozencraft, who lived near Red Bluff during the winter of 1850-51. He informed Harkness that he saw a great fire east of Lassen that continued for many nights but never changed its position.
After Harkness’ findings were published, it served as a reminder to many that a volcanic eruption could be impending. It was not for decades that Harkness’ theory was challenged. The whole issue has been resolved only within the last decade by the United Stated Geologic Survey, which determined that Cinder Cone’s last eruption occurred sometime around 1666, not 1850.