“…The haemoglobin concentration for one of the pigs in the Igroup was shown to increase strikingly faster and to a higher level than for the other three animals in the series. The higher spleen weight observed in the same I-group pig, as compared to that of the other three pigs in the Fj-generation, does not exceed the normal limits for spleen weights, hut is mentioned as a parallel to the tendency of increased spleen weights in dogs noted by Larson et al [8], as men tioned in the introduction.…”