information about the precursors of the formaldehyde; it is possible that some are non-steroid in nature.With the methods of steroid analysis available at the present time, it is not possible to determine what proportion of the formaldehyde formed during the oxidation is of steroid origin.The method has been of value in following extraction and concentration procedures.SUMMARY 1.A micro method for the determination of 'formaldehydogenic steroids' using sodium bis- muthate as the oxidant has been described.2. The isothermal distillation and subsequent colorimetric determination of the formaldehyde takes place at 1000 in a stoppered Conway unit.The determination is complete within 3 hr.and the method is suitable for batch determinations.3. The method has an accuracy of + 1-5 / in the range 5-25 m-ptmoles.We should like to express our thanks to Prof. E. C.
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Maclagan et al. (1954) studied this question.