The cell in development and inheritance . B Fig- 93- — Fertilization of the egg of the gasteropod, Pterotrachea. \ BOVERI.]A. The egg-nucleus {E) and sperm-nucleus (5) approaching after formation of the polarbodies; the latter shown above {P. B.); each germ-nucleus contains sixteen chromosomes; thesperm-amphiaster fully developed. B. The mitotic figure for the first cleavage nearly established;the nuclear membranes have disappeared, leaving the maternal group of chromosomes above thespindle, the paternal below it. PRELIMINARY GENERAL SKETCH 187 m L ^ f C

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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcells, bookyear1902