The dispute between Huxley and Owen over human uniqueness began in public at the 1860 Oxford evolution debate, during a meeting of the British Association for the Advancement of Science in Oxford on Thursday 28 June 1860. After Charles Daubeny's paper "On the Final Causes of the Sexuality of Plants with Particular Reference to Mr. Darwin's Work", the chairman asked Huxley for comments, but he declined as he thought the public venue inappropriate. Owen then spoke of facts which would enable the public to "come to some conclusions ... of the truth of Mr. Darwin's theory", reportedly arguing that "the brain of the gorilla was more different from that of man than from that of the lowest primate particularly because only man had a posterior lobe, a posterior horn, and a hippocampus minor." In response, Huxley flatly but politely "denied altogether that the difference between the brain of the gorilla and man was so great" in a "direct and unqualified contradiction" of Owen, citing previous studies as well as promising to provide detailed support for his position.