THE OCCURRENCE DURING ACUTE INFECTIONS OF A PROTEIN NOT NORMALLY PRESENT IN THE BLOOD : I. DISTRIBUTION OF THE REACTIVE PROTEIN IN PATIENTS' SERA AND THE EFFECT OF CALCIUM ON THE FLOCCULATION REACTION WITH C POLYSACCHARIDE OF PNEUMOCOCCUS.

The serum obtained from human beings and monkeys during the acute phase of diverse infections contains a protein which is precipitable by the C polysaccharide of pneumococcus. The distribution of this protein in acute phase serum has been studied, and the effect of calcium on the precipitation reaction with the C polysaccharide is described. Other distinctive features of this reaction are discussed.

STUDIES ON THE SOMATIC C POLYSACCHARIDE OF PNEUMOCOCCUS : II. THE PRECIPITATION REACTION IN ANIMALS WITH EXPERIMENTALLY INDUCED PNEUMOCOCCIC INFECTION.

The capacity of the serum of rabbits following intradermal pneumococcus infections to precipitate in the presence of pneumococcus C polysaccharide has been studied during the resultant periods of active infection and during recovery. In rabbits infected with Type I, III, or VIII pneumococci, large hemorrhagic lesions are produced which frequently bring about death of the animals after a febrile illness of 3 to 4 days. Repeated precipitation tests with the sera of these animals have been uniformly and consistently negative, not only during the acute illness but in the recovery period as well.

STUDIES ON THE SOMATIC C POLYSACCHARIDE OF PNEUMOCOCCUS : I. CUTANEOUS AND SEROLOGICAL REACTIONS IN PNEUMONIA.

A study of 46 cases of pneumococcus pneumonia has shown that a characteristic response may be elicited by the intracutaneous injection of 0.1 mg. of the somatic C polysaccharide of pneumococcus.