In reviewing literature relative to this subject, the writer has found a total absence of any authentic conclusions regarding the blood in infectious diarrhea. Starr,1 Whipham2 and Keating3 make no mention of the blood whatsoever. Taylor and Wells,4 Ashby and Wright,5 Carmichael6 and Oppenheim7 also failed to mention this important point. The textbooks of Donkin,8 Smith,9 Carr10 and Cotton11 have left unsaid all matters pertaining to this subject. Even the most recent works on pediatrics, by such authorities as Koplik,12 Hutchinson,13 Chapin and Pisek,14 Rachford,15 Cautley,16 Fischer,17 McCaw,18 Rotch,19 Still,20 Holt,21 Garrod, Batten, Thursfield22 and Morse,23 have all left this important topic untouched. In addition, a careful survey of the works of different authorities who have made hematology a special study in the majority failed to record