Abstract
IT has recently been shown by Allison1 on the grounds of cardiac output × erythrocyte life-span/blood volume that in spite of quite different erythrocyte life-spans in man, dog and rat the average number of times an erythrocyte is oxygenated and deoxygenated, that is, the number of recirculations, is in all three species of the same order, about 180,000 times. It might be of interest to determine if this relation is valid for embryonic erythrocytes also, and for their various lines respectively. Unfortunately, only incomplete data or none at all are available for mammalian embryos, though values covering nearly the whole incubation period have been published for chick embryos.
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