RT Journal Article SR Electronic T1 On the origin of species JF American Journal of Science JO Am J Sci FD American Journal of Science SP 1 OP 13 DO 10.2475/ajs.s2-30.88.1 VO s2-30 IS 88 A1 Theophilus Parsons YR 1860 UL http://www.ajsonline.org/content/s2-30/88/1.abstract AB