Demographic forecasts, like all forecasts of social events, have but a comparative value. It is true that demographic movements are especially biological manifestations, but it is also true that economic and social factors exercise a profound influence in limiting their regularity and can disturb them very considerably. It is better therefore not to make long prophecies. What is certain is that the French population has increased almost imperceptibly while the population of Germany augmented very rapidly. The annual average of births in the five years before the War, 1908-13, was 762,000 in France and 176,000 in Belgium. In Germany it was 1,916,000. The average of deaths was 729,000 in France, 117,000 in Belgium, and 1,073,000 in Germany. Thus, per thousand, the excess of births in France was 0.9, in Belgium 7.7, in Germany 13. The War has terribly aggravated the situation in France, whose demographic structure is far from being a healthy one. From statistics published giving the first results of the French census of 1921--without the new territory of Alsace-Lorraine--France, in the interval between the two census periods, has decreased by 2,102,864; from 39,602,258 to 37,499,394 (1921). The deaths in the War do not represent a half of this decrease, when is deducted the losses among the coloured troops and those from French colonies who fought for France. The new territories annexed to France do not compensate for the War-mortality and the decrease in births. We may presume that if normal conditions of life return, the population of Germany and German-Austria will be more than one hundred millions, that the population of Belgium altogether little less than fifty millions, that Italy will have a population much greater than that of France, of at least forty-five million inhabitants, and that Great Britain will have about sixty million inhabitants. In the case of the Germans we have mentioned one hundred million persons, taking into consideration Germany and German-Austria. But the Germans of Poland, of Czeko-Slovakia and the Baltic States will amount to at least twenty millions of inhabitants. No one can make forecasts, even of an approximate nature, on Russia, whose fecundity is always the highest in Europe, and whose losses are rapidly replaced by a high birth-rate even after the greatest catastrophes. And then there are the Germans spread about the world, great aggregations of populations as in the United States of America and in a lesser degree in Brazil. Up to now these people have been silent, not only because they were surrounded by hostile populations, but because the accusation of being sons of the Huns weighed down upon them more than any danger of the War. But the Treaty of Versailles, and more still the manner in which it has been applied, is to dissipate, and soon will entirely dissipate, the atmosphere of antipathy that existed against the Germans. In Great Britain the situation has changed profoundly in three years.