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Summary 1. A case of erythroblastosis fetalis in a premature infant from a motherwith sickle cell anemia is reported. 2. Treatment was by exchange transfusion with a successful end result. 3. The transfusion technique is described. 4. The rationale for the treatment of icterus gravis by exchange transfusion is briefly discussed.

Audiogenic stress has been shown to have an effect on the development of molar teeth. The present study demonstrates the relative contribution of prenatal and postnatal stress components to increases in fluctuating dental asymmetry in the laboratory rat. It is shown that there is a limit to the amount of change which can be environmentally induced and that if this limit is reached with prenatal stress, postnatal stress will have no significant effect. Audiogenic stress is shown to effect differentially mandibular and maxillary first molars. Length is stable for the maxillary dentition and width is stable in the mandibular molars.

Albino mice (BALB), conceived, born, and raised at 10 degrees C exhibit significant changes in the magnitude of fluctuating dental asymmetry. These results confirm the hypothesis that the dentition responds to the general stress syndrome.