Abstract
Extract About five years ago a new way of preventing colbalt deficiency disease became available. Dewey et al. (1958) Dewey, D. W. , Lee, H. J. and Marston, H. R. 1958. Nature, 181: 1367–1367. [Lond.] [Crossref], [PubMed], [Web of Science ®] [Google Scholar] reported that when semi-porous pellets containing cobaltic oxide were given to sheep they were retained in the forestomachs and released a continuous and adequate supply of colbalt for the production of vitamin B12