Letter from Russell Chittenden to William B Hardy Has read Hardy's letter and agrees with the statement 'the world can no longer afford its former extravagent physiological habits' -- notes that the present situation means that people must come down to the level of necessity -- that the Germans have profited from the reduction in food -- thinks that the conflict will be decided by food supply -- notes that Lusk has a report on the possibility of establishing nitrogen equilibrium on a potato diet. 4 April 1918