Offprint of "Chemical Diversity and the Origins of Life" by N W Pirie Offprint of "Chemical Diversity and the Origins of Life" by N W Pirie, published in <i>The Origin of Life on the Earth</i>, edited by A I Oparin, A G Paynshii, A E Braunshtein, and T E Pavlovskaya, (New York: MacMillan & Co., 1959), pp.76-83. 1959