Regeneration . embryos, although there are a few casual observa-tions ^ in which such a fusion has been observed. The problems thatarise in connection with the union of two eggs are full of Q,gg has the power of producing an embryo of normal size. Iftwo eggs are united into one, will a single giant organism result, ortwo organisms. If the former, we must suppose that a new organi-zation is formed of double size. Whether an upper limit of organiza- 1 Metschnikoff (86), Herbst (92). 18 8 REG EN ERA TION tion exists can only be determined by such an experiment. If twofused organisms
Regeneration . embryos, although there are a few casual observa-tions ^ in which such a fusion has been observed. The problems thatarise in connection with the union of two eggs are full of Q,gg has the power of producing an embryo of normal size. Iftwo eggs are united into one, will a single giant organism result, ortwo organisms. If the former, we must suppose that a new organi-zation is formed of double size. Whether an upper limit of organiza- 1 Metschnikoff (86), Herbst (92). 18 8 REG EN ERA TION tion exists can only be determined by such an experiment. If twofused organisms result from the fusion of two eggs, it would showthe structure of the Qgg is of such a kind that two organizations can-not readjust themselves into a single one of double size. Moreover, itis important to discover whether any difference exists as to the stageof development at which the union is brought about, for it is conceiv-able that while a rearrangement is possible at one stage, it mightnot be at
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