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SCIENCE was made in 1908 and had been standing unchanged since that time. A general new culture of rotifers was made from these fertilized eggs and then a fern fcinales were selected at random and fed upon a continuous diet of the colorless P o l y t o m a in watch glasses. After a few generations a very high percentage of females were produced. At this period adult females were talcen froin several of the watch glasses and placed in some filtered water from a jar in which a general c,ulture ofdoi:10.1126/science.39.1014.833 pmid:17821332 fatcat:l54id3skonexdh7eadvkcrozlm