increasing control of natural forces give easier conditions for the struggle for existence. This means the most to those who have inherited the least. It is, however, obviously a temporary advantage, for the human race will, in a few generations, find itself face to face with overpopulation and harder conditions. In the meantime philosophies and notions win general acceptance which are relatively true in the exceptional period. They are broadly stated and confidently accepted in the mores and in legislation. Rights are changed in popular opinion and in constitutions, and the location of political power is shifted, especially as between classes; notions about property, marriage, family, inheritance, and so on, change to suit facts and faiths about the struggle for existence. Then groups and parties will form and war will occur between them. Great dogmas will be put forth at all stages of these movements and appropriate watchwords will never be wanting.
