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1 From the Marine Biological Laboratory, Woods Hole, and the Biological Laboratory, Princeton University
1. Non-nucleate fractions of Arbacia eggs obtained by centrifuging can be activated by parthenogenetic agents, and develop; these may be termed "parthenogenetic merogones."
2. Asters are formed and cell division takes place without nuclei.
3. Cleavages of non-nucleate fractions are strikingly similar to those of nucleate fractions (or whole eggs) of the same stage of development.
4. Many cleavages, in sequence, result in the formation of a blastula of as many as 500 cells.
5. Blastulæ emerge from the fertilization membranes; one embryo was still viable after a month.
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