candidates for exploitations as fluorometric reagents for magnesium. The ratio of the intensity of fluorescence of the magnesium derivative to that of the calcium derivative is greater for B-3 (60) than for B-2 (17) but the intensity, and therefore the sensitivity, is only half as great. There is a greater difference between the respective formation constants for B-2 than B-3 also; in fact, as judged spectrophotometrically, B-2 does not react with calcium. Log formation constant" Compound Mg Ca B-2 4.85 b B-3 3.50 1.23 0 Data of Diehl and Ellingboe (1). 6 No compound formed as judged by absorption spectra.

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