To a certain extent, the like is true of the agricultural classes of Europe. A peasant’s wife helps her husband in the field, tends the cattle, and takes part in the fishing. She cooks and washes, sews, spins, and weaves. In a word, she does many useful things about which women of the well-off classes never think of troubling themselves. Hence in Russia, as we are informed by M. Pietro Semenow, the small agriculturists, who form an enormous proportion of the population, are in the habit of arranging for the marriage of their sons at as early an age as possible in order to secure an additional female labourer.[867] Even in cities it is not among the poorest classes that celibacy is most frequent. A “gentleman,” before marrying, thinks it necessary to have an income of which a mere fraction would suffice for a married workman. He has to offer his wife a home in accordance with her social position and his own; and unless she brings him some fortune, she contributes but little to the support of the family. Professor Vallis has made out that, in the nobility and higher _bourgeoisie_ of Sweden, only 32 per cent. of the male population and 26 per cent. of the female population are married, whilst the averages for the whole population amount to 34 and 32 per cent. respectively.[868] Some such disproportion must always exist when the habits of life are luxurious, and the amount of income does not correspond to them. And it is obvious that women have to suffer from this trouble more than men, the life of many of them being comparatively so useless, and their pretensions, nevertheless, so high. Another reason why the age for marriage has been raised by advancing civilization is, that a man requires more time to gain his living by intellectual than by material work. Thus, miners, tailors, shoemakers, artisans, &c., who earn in youth almost as much as in later life, marry, as a rule, earlier than men of the professional class.[869] In most European countries the decrease in the number of married people is also partly due to the drafting of young men into the army, and their retention in it in enforced bachelorhood during the years when nature most strongly urges to matrimony. Of course these conditions affect directly the marriage age only of men, but indirectly they influence that of women also. Many fall in love with their future wives long before they are able to form a home, and those who marry late generally avoid very great disparity of age.[870] In one respect the average age at which women marry may be said to depend directly upon the degree of civilization. Dr. Ploss has justly pointed out that the ruder a people is, and the more exclusively a woman is valued as an object of desire, or as a slave, the earlier in life is she generally chosen;[871] whereas, if marriage becomes a union of souls as well as of bodies, the man claims a higher degree of mental maturity from the woman he wishes to be his wife.