As far as we know, there have been no analyses of the mineral content of human milk with reference to possible racial variations. Our purpose in this work was to make complete mineral analyses of, or at least to include in our study, those elements which are thought to have an influence on the production of rickets, and then to see whether there is any constant difference in the milk from those races which are prone to have this disease and those which are not so susceptible.
This problem has been attacked from the standpoint of individual elements, but only once as far as we know from the standpoint of a complete mineral analysis. Bahrdt and Edelstein1 collected data which showed that the calcium content of the milk from mothers whose children were rachitic was much less than that of mothers whose children were nonrachitic. The average content for