A delicate arrangement : the strange case of Charles Darwin and Alfred Russel Wallace - Brackman, Arnold C. (New York, N.Y. : Times books, 1980)
Includes two essays by Wallace, "On the law which has regulated the introduction of new species" and "On the tendency of varieties to depart indefinitely from the original type."
Keywords: Darwin, Charles, -- 1809-1882.; Wallace, Alfred Russel, -- 1823-1913.