Abstract
While much has been written concerning the digestion of protein by the gastro-intestinal tract of the infant and many investigations of a chemical nature have been made for the determination of the presence of protein in the infant stool, still no extensive effort has been made, so far as we can find, to apply the biologic test. In 1905 Hamburger<sup>1</sup>tested a limited number of cases and found that the precipitin reaction was never positive with cow lactoserum, but always with antihuman serum. Since then, the only examinations carried on in this manner have been for the determination of the nature of the material found in the curds so frequently present in the stools of infants. Talbot<sup>2</sup>first, and later Uffenheimer and Takens<sup>3</sup>and Maccone<sup>4</sup>report positive results with antiserum to cow milk casein. In the examination of the stools of three normal bottle fed infants
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