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_Transmitted May 11, 1959._

27-9040

Transcriber's Notes:

Changed "vestigal" to "vestigial" on page 578: vestigal-winged flies.

Changed "inmature" to "immature" in Table 2: nematodes that were inmature.

Changed "auomatically" to "automatically" on page 582: not auomatically
invalid.

Changed "Syzmanski" to "Szymanski" in Literature Cited on page 585.

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