Elisha Foote's term as Commissioner of Patents expires.

Elisha Foote, Eunice's husband, is appointed the Commissioner of Patents, serving through April 25, 1869. This appointment leads the entire family to relocate to Washington, D.C., and reflects Elisha's standing in the legal and scientific community of the time.

Eunice Newton Foote's second paper, "On a New Source of Electrical Excitation", is read by Joseph Henry at the annual AAAS conference held in Montreal. The paper explores static electricity in atmospheric gases. This event marks one of the rare instances of a woman's scientific work being presented at a major scientific conference during the 19th century.

Scientific American praises Eunice Newton Foote in the article titled "Scientific Ladies—Experiments with Condensed Gases." The authors express their admiration for her theories backed by experiments. The article acknowledges her deep knowledge in physical science and says that she was deeply acquainted with almost every branch of physical science.

Eunice Newton Foote's paper, "Circumstances Affecting the Heat of the Sun's Rays," is presented at the tenth annual AAAS meeting in Albany, New York. Joseph Henry presents it on her behalf. This paper marks a crucial moment in climate science history, as it demonstrates the heat-trapping properties of carbon dioxide and hypothesizes its impact on climate, though Foote's contributions were not fully recognized at the time.

Eunice Newton marries Elisha Foote Jr., a lawyer, in East Bloomfield, New York. This marriage marks a significant change in Eunice's life, leading to her settling in Seneca Falls and providing her with the social and intellectual environment to pursue her scientific interests. The marriage occurred in the center of social activism of that time.