1. Baker, H., Herbert, V., Frank, O., Pasher, I., Hutner, S. H., Wasserman, L. R., and Sobotka, H. (1959). Clin. Chem., 5, 275.
2. Herbert, V. (1961). J. clin. Invest., 40, 81.
3. Toepfer, E. W., Zook, E. G., Orr, M. L., and Richardson, L. R. (1951).
4. Folkc acid content of foods. Agriculture Handbook No. 29;States Department of Agriculture. Govt. Ptg. Off. Washington, D.C.Waters; H., A.; Mollin, D.L.;J. clin. Path,1961
5. Broadsheets prepared by the Association of Clinical Pathologists The following broadsheets (new series) are published by the Association of Clinical Pathologists. They may be obtained;Tierney, R.B.H.; Laboratory, Pathological; Street, Boutport; Barnstaple, N.Devon