- Normal variations in the elementary composition of cortical bone from sixteen different adult vertebrates were studied.
- Variations in the mineral (ash) and water content of bone exhibited what could be a necessary reciprocal relationship.
- The mineral components, calcium, phosphorus and magnesium were positively correlated with hexosamine (ground substance) and negatively correlated with OH-proline (collagen).
- Although positively correlated, the variations in total CO2, sodium and citric acid were much less specific.
- All specimens exhibited a Ca/P molar ratio of 1.67 or larger depending on the amount of CaCO3 present.
- These differences in bone composition undoubtedly have physiological significance and their further elucidation is necessary for the valid interpretation of experimental data in all areas of mineral metabolism.