...determined, the definite periods into which the ontogeny falls, the sudden transitions from one phase of activity to another — these and many other features...late rapidly gained ground among embryologists, that (i) the bilaterality of the adult is predetermined in the ovum and therefore (2) manifests itself throughout...

...the bilateral ity does not appear at the beginning of development ' i. It 1) Spaced in the original. appears only at a comparatively late stage, and by...and striking as to possess an absolutely dramatic interest1)." And so on. I refrain from further quotation, because Wilson's work contains no real solution...

...forerunners of the bilateral arrangement of parts in the adult, and, as such, these explanations belong to the general problem of bilateral symmetry, which...striking as to possess an absolutely dramatic interest." And so on. I refrain from further quotation because Wilson's work contains no real solution of the...

...the causes that determine the transformation of the one into the: other ? " Further on he writes : " The most striking feature in the cleavage, and the...striking as to possess an absolutely dramatic interest." And so on. I refrain from further quotation, because Wilson's work contains no real solution of the...