Letter from Michael Heidelberger to Otto Loewi Congratulates Loewi on his speech [given at the American Nobel Anniversary Dinner] -- notes that it 'was a fine antecdote to the sour note struck by Pearl Buck' -- enjoyed meeting Mrs Ehrlich -- hopes Loewi is well. Note from Loewi on the bottom reads 'he is the greatest immunologist of the world.' 13 December 1942