What is the next great lesson of the war? It is that if Britain has to be thoroughly equipped to meet any emergencies of either war or peace it must take a more constant and a more intelligent interest in the health and fitness of the people. ... I solemnly warn my fellow-countrymen that you cannot maintain an A1 Empire with a C3 population. (Cheers.) Unless this lesson is learned the war is in vain. Remember that the health of the people is the secret of national efficiency and national recuperation.