"Causes affecting health and shortening life may be inappreciable in the individual, but sufficiently obvious when their effect is multiplied a thousandfold. If the conditions of society render us liable to many diseases, they in return enable us to establish the general laws of life and health, a knowledge of which soon becomes a distributive blessing. The cure of individual diseases, whilst we leave open the dark fountains from which they spring, is to labour like Sisyphus, and have our work continually returning upon our hands. And, again, there are diseases over which, directly, we have little or no control, as if Providence had set them as signs to direct us to wider fields of inquiry and exertion. Even partial success is often denied, lest we should rest satisfied with it, and forget the _truer and better means_ of prevention." [9] Medical and sanitary science have made great progress in the conquest of enteric fever, diphtheria, scarlet fever, measles, and whooping cough. The mortality from bronchitis and from pulmonary tuberculosis has also been reduced, but nevertheless tuberculosis still claims more victims in the prime of life than any other malady. It is a disease of civilisation and is intimately associated with economic conditions. The history of tuberculosis has yet to be written. On the other hand, deaths from certain other diseases are actually increasing, as witness the following figures from the Reports of the Registrar-General for England and Wales: Disease. Number of Number of deaths in Deaths in 1898. 1919. Diseases of the heart and circulatory system 50,492 69,637 Cancer 25,196 42,144 Pneumonia 35,462 38,949 Influenza 10,405 44,801 In view of these figures it is folly to suppose that the final conquest of disease is imminent. (b) War War, foreign or civil, is another sword hanging over civilisations, whereby the fruits of a long period of growth may be destroyed in a few years. After the Thirty Years War the recovery of Germany occupied a century and a half. During the fourteen years of the Taiping rebellion in China whole provinces were devastated and millions upon millions of people were killed or died. In spite of the Great War during the past decade, there are some who would delude themselves and others into the vain belief that, without a radical change in international relations and a determined effort to neutralise its causes, there will be no more war; but unless the nations learn through Christianity that justice is higher than self-interest the following brilliant passage by Devas is as true to-day as when it was written in 1901: