It was discovered in 1885 by Dr. Daniel E. Salmon. An American scientist. It was discovered in 1885 by Dr. Daniel E. Salmon. An American scientist. It was discovered in 1885 by Dr. Daniel E. Salmon. An American scientist. It was discovered in 1885 by Dr. Daniel E. Salmon. An American scientist. It was discovered in 1885 by Dr. Daniel E. Salmon. An American scientist.