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In the first paper,3 it was mentioned that no complex compounds of high molecular weight amines and metal salts containing a ratio of amine to metal greater than 2:1 could be obtained. However, it has been noted that a solution of a 2:1 complex containing copper becomes a deeper blue upon the addition of an excess of the corresponding amine. With the thought that compounds other than the 2:1 complex might exist in solution, we have here attempted to apply the Method of Continuous Variations as expanded by Vosburgh and Cooper4 to the dodecylaminecupric acetate system. ExperimentalStarting Materials.-Dodecylamine and cupric acetate were prepared as described earlier.3 Reagent-grade trichloromethane and absolute ethanol were used throughout.Instrument.-The optical density measurements were performed in a Beckman Photoelectric Spectrophotometer, Model DU, with a cell length of one centimeter.Data.-Seven solutions, all 0.001 M with respect to cupric acetate and ranging from zero to 0,006 M with respect to dodecylamine, were made up in a solvent comprising 90% of trichloromethane and 10% of ethanol by volume. The absorption spectra of these solutions were

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Summary Lecithin was prepared from crude soybean phosphatides by the Pangborn modification of the cadmium chloride method. Results of analysis indicated that this preparation was 97 per cent lecithin and 3 per cent cephalin. Its fatty acid composition was as follows: palmitic—15.77 per cent; stearic—6.30 per cent; oleic—12.98 per cent; linoleic—62.92 per cent; linolenic—2.02 per cent.

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