How influential public opinion may be in the selection of mates is indicated by the influence it already exerts—in less than a century—in the limitation of offspring. This is well marked in some parts of France. Thus, concerning a rural district near the Garonne, Dr. Belbèze, who knows it thoroughly, writes (La Neurasthénie Rurale, 1911): "Public opinion does not at present approve of multiple procreation. Large families, there can be no doubt, are treated with contempt. Couples who produce a numerous progeny are looked on, with a wink, as 'maladroits,' which in this region is perhaps the supreme term of abuse.... Public opinion is all-powerful, and alone suffices to produce restraint, when foresight is not adequate for this purpose."

De Quincey in his Confessions of an Opium Eater referred to the power that many, perhaps most, children possess of seeing visions in the dark. The phenomenon has been carefully studied by G.L. Partridge (Pedagogical Seminary, April, 1898) in over 800 children. He found that 58.5 of them aged between thirteen and sixteen could see visions or images at night with closed eyes before falling asleep; of those aged six the proportion was higher. There seemed to be a maximum at the age of ten, and probably another maximum at a much earlier age. Among adults this tendency is rudimentary, and only found in a marked form in neurasthenic subjects or at moments of nervous exhaustion. See also Havelock Ellis, The World of Dreams, chap. II.