Addendum
In the article by Richard C. Greulich and C. P. Leblond, entitled "Radioautogiaphic Visualization of the Formation and Fate of the Organic Matrix of Dentin," which appeared in the December, 1954, issue of the JOURNAL, pages 859-872, the following addition should be made: On page 869, in the fourth paragraph of text material, in line 11, the sentence ending ". . . to consist mainly of collagenous material.14," should be followed by a footnote reading, "However, the presence of mucopolysaccharides in predentin has been suggested by Verne and his co-workers,15, 16 on the basis of evidence contrary to that presented here. We have been unable to explain this discrepancy.
