The explanation of this apparent paradox lies in the fact, which never seems to be properly understood, that the population of the world and of nearly all countries is constantly being kept in check by insufficiency of food. A French statistician, M. Hardy, has calculated (and his figures, though challenged by great authorities, have now been accepted) that if the total food production of the world were fairly distributed among its inhabitants, the ration of proteids available for each would only be two-thirds of that recognised as necessary for efficiency. Mr. Seebohm Rowntree has shown that large numbers of families in our own country—the richest in the world—have deficiencies of protein in their diet by amounts up to 40 per cent., and over 2,500,000 adult male workers have wages of 25s. a week or less, upon which with the present cost of living and rent in towns it is impossible to bring up more than three children properly. As a result, whenever families are large a considerable proportion of the children die, and of those who survive many grow up stunted and incapable of assimilating a good training. The over-crowding caused by large families with an ever decreasing margin for rent is also a potent cause of disease and of immorality—the latter evil being further greatly intensified by the economic difficulties in the way of marriage that are the chief bar to the prevention of those terrible diseases for which the Royal Commission, presided over by our Chairman, is investigating a remedy.