Yellow Springs, OH: The American Humanist Association, 1964. Pamphlet. 16p., stapled wraps, 3.75x8.5 inches, staples rusted, bottom corner of pp15/16 dog-eared else very good condition. Reprint of a freethought speech given by Carlson in 1931 and published in Science Magazine in the same year. Both Carlson and Muller were eminent scientists.