“…according to the procedure described in an earlier publication. 12 Calcium and inorganic phosphorus were determined in the serum by the Tisdall 13 modification of the Kramer and Tisdall method and the Briggs modification 1 * of the Bell-Doisy method, respectively. Bone ash determinations were made at 9 days and blood calcium and inorganic phosphorus as well as bone ash at 4, 7, and 9 weeks of age.…”