RT Journal Article SR Electronic T1 Sir William Edmond Logan JF American Journal of Science JO Am J Sci FD American Journal of Science SP 81 OP 93 DO 10.2475/ajs.s3-11.62.81 VO s3-11 IS 62 A1 B. J. Harrington YR 1876 UL http://www.ajsonline.org/content/s3-11/62/81.abstract AB