Abstract
IN the communication from Dunachie and Fletcher1 it is shown that when paraquat is injected into fertile hen's eggs to give a final concentration greater than approximately 0.1 p.p.m. the subsequent rate of hatching was reduced. Because hens may eat food containing residues of paraquat from previous sprayings I made the following experiment to determine whether the amount of paraquat likely to be present would cause similar effects.
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