This early essay of Spencer's was originally published anonymously in The Leader for March 20 1852. It was the second contribution in a regular series entitled "The Haythorne Papers". Spencer's identity was revealed some while after. It is reproduced in Herbert Spencer, Essays Scientific, Political & Speculative, Williams and Norgate (3 vols 1891) pp.1 7]; and here in full. David Clifford, Ph.D., Cambridge University, prepared the html text in 1997; George P. Landow reformatted it in 2008.