1. Spectrophotometric data for oils F 10 to F 14 were taken from the work of Wesson. Cotton Oil Press 6, No. 5, September, 1922.
2. B. S. Jour. Research 1, 793 (1928) R. P. 30. The arrangement of light source and auxTary equipment for the spectrophotometric analysis of vegetable oils was not the same as described in this paper, but the method of measurement was essentially the same. Brass cells with glass end-plates were used to contain the oils. The measured transmission of these end-plates were a thin film of bleached oil between was found to be 0.892 for all wave lengths. Each measured transmission value of the cell filled with oil was divided by this number to give the transmittance of the oil itself, as represented in the figures and in Table 1.
3. See Judd, B. S. Jr. Research,1, 859, footnote 18 (1928).
4. Cotton Oil Press, January, 1920.
5. Cotton Oil Press,6, No. 5. September, 1922. These spectrophotometric data on the peanut, rape, and olive oils are reproduced in the present paper.