Outline 4.0 Introduction 4.1 Methods 4.2 Methods of Treating Data, Control Groups 4.3 Hematological Findings, General 4.31 Hematological Findings, Group I Rongelap 4.32 Hematological Findings, Group II Ailinginae 4.33 4.4 4.5 ¥ Hematological Findings, Group IV Utirik 4.34 Hematological Findings, Group III Rongerik (Americans) 4.35 Monocytes and Eosinophiles, All Groups 4.36 Hematocrit, All Groups 4.37 Morphology of Peripheral Blood 4.38 Comparison of Hematological Findings in Children and Adults, Group I Rongelap Discussion 4.41 General 4.42 Comparison With Japanese Hiroshima and Nagasaki Data 4.43 Comparison With Data From Laboratory Accidents 4.44 Comparison With Animal Data 4.45 Approximation of Minimal Lethal Dose for Man 4.46 Peripheral Counts as an Index of Severity of Exposure Conclusions