Abstract
DR. OSCAR RIDDLE has previously brought forward evidence to show that male pigeons arise from eggs (yolks) of less storage metabolism, which implies small size and higher (oxidising) metabolism, and that females arise from eggs (yolks) of greater storage metabolism, which implies large size and lower (oxidising) metabolism. He has now (Journ. Exper. Zoology, vol. xxvi., 1918, pp. 237-54) studied two cases of female “identical twins,” and seeks to show that the ova (yolks) which produced both of them were extraordinarily and abnormally large.
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