1. Robertson, T. B., in Abt, I. A., Pediatrics, Philadelphia and London, 1, chap. 4 (1923).
2. White House conference on child health and protection, Growth and development of the child, pt. 3, Nutrition, New York (1932).
3. Vaughan, J. M., The anaemias, London, chap. 1 (1934).
4. Unpublished data.