The success with which medicine and sanitary science have laboured to prolong life, to extirpate or diminish different forms of disease and to alleviate their consequences is abundantly proved. In all civilised countries the average of life has been raised, and there is good reason to believe that not only old age but also active, useful, enjoyable old age has become much more frequent. It is true that the gain to human happiness is not quite as great as might at first sight be imagined. Death is least sad when it comes in infancy or in extreme old age, and the increased average of life is largely due to the great diminution in infant mortality, which is in truth a very doubtful blessing. If extreme old age is a thing to be desired, it is perhaps chiefly because it usually implies a constitution which gives many earlier years of robust and healthy life. But with all deductions the triumphs of sanitary reform as well as of medical science are perhaps the brightest page in the history of our century. Some of the measures which have proved most useful can only be effected at some sacrifice of individual freedom and by widespread coercive sanitary regulations, and are thus more akin to despotism than to free government. How different would have been the condition of the world, and how far greater would have been the popularity of strong monarchy if at the time when such a form of government generally prevailed rulers had had the intelligence to put before them the improvement of the health and the prolongation of the lives of their subjects as the main object of their policy rather than military glory or the acquisition of territory or mere ostentatious and selfish display!