Madame de Graffigny had begged Turgot's opinion upon the manuscript of a work composed, as so many others were, after the pattern of Montesquieu's _Lettres Persanes_,--now nearly thirty years old,--and bearing the accurately imitative title of _Lettres Peruviennes_. A Peruvian comes to Europe, and sends to a friend or mistress in Peru a series of remarks on civilisation. Goldsmith's delightful _Citizen of the World_ is the best known type in our own literature of this primitive form of social criticism. The effect upon common opinion of criticism cast in such a mould, presenting familiar habits, institutions, and observances, in a striking and unusual light, was to give a kind of Socratic stimulus to people's ideas about education, civilisation, conduct, and the other topics springing from a comparison between the manners of one community and another. That one of the two, whether Peru, or China, or Persia, was a community drawn mainly from the imagination, did not render the contrast any the less effective in stirring men's minds. By the middle of the century the air was full of ideas upon these social subjects. The temptation was irresistible to turn from the confusion of squalor, oppression, license, distorted organisation, penetrative disorder, to ideal states comprising a little range of simple circumstances, and a small number of types of virtuous and unsophisticated character. Much came of the relief thus sought and found. It was the beginning of the subversive process, for it taught men to look away from ideas of practical amelioration. The genius of Rousseau gave these dreams the shape which, in many respects, so unfortunately for France, finally attracted the bulk of the national sentiment and sympathy. But the vivid, humane, and inspiring pages of _Emile_ were not published until ten years after Turgot's letter to Madame de Graffigny:[24] a circumstance which may teach us that in moral as in physical discoveries, though one man may take the final step and reap the fame, the conditions have been prepared beforehand. It is almost discouraging to think that we may reproduce such passages as the following, without being open to the charge of slaying the slain, though one hundred and twenty years have elapsed since it was written. [Footnote 24: Written in 1751. _OEuv._ ii. 785-794.]