1. l. Contribution No. 73 of the McCollum-Pratt Institute. These studies were supported by a grant from the National Institutes of Health U.S. Public Health Service (HEW).
2. A. J. Carlson and F. Huelzel , J. Nutrition 36 , 27 ( 1948 ).
3. O. Acknowledgment is made to Curt Richter of The Johns Hopkins Hospital for his participation in this phase of the study.
4. G. M. Higgins , Blood 4 , 1142 ( 1949 ).
5. E. R. Hall University of Kansas personal communication.