Naturalist, born at Kingston, Canada; took an honors degree in science at Cambridge; came under the influence of Darwin, whose theory of evolution he advocated and developed in lectures and various works, e. g. "Scientific Evidences of Organic Evolution," "Mental Evolution in Animals," "Mental Evolution in Man"; his posthumous "Thoughts on Religion" reveal a marked advance from his early agnosticism towards a belief in Christianity; founded the Romanes Lectures at Oxford (1848-1894).