"On Geological Time."
On 27 February 1868, William Thomson speaks to the Geological Society of Glasgow “On Geological Time.” The address is a full-bore challenge to the soundness of contemporary geological science, with respect to process and its blithe disregard of the discoveries of physics, calling for fundamental reform. Image: Photograph of William Thomson, Lord Kelvin. This image is in the public domain in the United States because its copyright has expired.