KARAYA GUM SENSITIVITY

To the Editor:— On page 747 of the March 2 issue ofThe Journalis an article on "Karaya Gum (Indian Gum) Hypersensitivity" by Dr. Karl D. Figley. We wish to call attention to some errors therein. The protein concentrations of the two samples of gum are given as 0.0019 mg. and 0.002 mg. per gram. These should read 19 mg. and 20 mg. respectively. Also the statement "It thus appears that karaya gum contains approximately 0.1 per cent total nitrogen" is incorrect, since on the basis of the analyses reported the total nitrogen content is approximately 1 per cent.