Abstract
The results are reported of determinations of serum iron, the total iron-binding capacity of serum, and serum copper in normals, and the methods employed are described. The serum iron concentration proved to be highest in males, the total iron-binding capacity alike in males and females. No relationship was observed between the serum iron and serum copper values by simultaneous determination, and no definite relation can be seen between the values of serum iron and total iron-binding capacity of serum.