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NOTES 1517 100-ml. portions of 5% acetic acid. The acetic acid extract was adjusted to pH 7.5, and 8 g. of precipitated amorphous alkaloids were separated by filtration. This product was dissolved in 60 ml. of ethanol, and 4 g. of oxalic acid in 20 ml. of hot ethanol was added. After standing overnight, a color-

Hecogenin has been transformed to A9,11)-dehydrotigogenin A7'9-22-isoallospirostadiene-3/S-ol in good over-all yield.

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