Abstract
The problem of tl~e nature of the calcium compounds of blood has long attracted the interest of biochemists, physiologists, and clinicians. The problem has many applications to both normal and pathological conditions. Rona and Takahashi (1) concluded tha t calcium occurs in blood serum in two forms only, as calcium bicarbonate which is completely diffusible, and as a calcium-protein compound, the calcium of which is non-diffusible. The possib'flity of calcium occurring in the blood as calcium phosphate was also considered by Rona and Takahashi but rejected on the following grounds. They pointed out tha t the only form of calcium phosphate tha t could exist at the hydrogen ion concentration of blood would be an insoluble one. They reasoned tha t this compound would therefore have to be present in suspension and would thus be non-diffusible, whereas they found that the inorganic phosphorus of the serum is entirely diffusible. According to Rona and Takahashi the calcium bicarbonate concentration of blood is expressed by the relation
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