IN the issue of NATURE for June 2 (p. 398) there is a letter from a correspondent in reply to the article on “The Nutritive Value of Black Bread.” The correspondent points out that the writer of the article overlooked one all-important question, viz. how much of the nitrogen present in each form of bread is actually digested? In the original article the writer complained that misleading statements were made by some politicians during the last Parliamentary General Election with regard to German black bread. No doubt some of your readers expected to see a letter or two in reply to this complaint. There has not been one.