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The blastoderm of the chick before incubation is found to be composed of spherical anucleate bodies which Schwann considers to be cells, because they almost certainly develop into the cells of the incubated blastoderm, which are clearly recognisable as such after eight hours' incubation.

In anucleate cells there is probably only a single process of layer formation round an infinitely small nucleolus.

He found that if the similar anucleate "polar lobe" of this form is removed at the two-celled stage, deficient larvæ are formed, in which the post-trochal region and the apical organ are absent.