From "Emile"

Almost certain Tolstoy had imbided a little Rousseau (may look up the influences later) before he voiced a "cure" for Moscow's prostitutes (did I read it in his letters or Wilson's bio?): Take them out of the corrupting city and put them in the country.

Anyway, here's a bit of Rousseau on the ill effects of the city:

     Men are not made to be crowded together in ant-hills, but scattered over the earth to till it. The more they are massed together, the more corrupt they become. Disease and vice are the sure results of over-crowded cities. Of all creatures man is least fitted to live in herds. Huddled together like sheep, men would very soon die. Man's breath is fatal to his fellows. This is literally as well as figuratively true.