24 llature of the fluorescent substen.ee * 16 D • Absorption spectre of fluorescing end nonf luorescing dye solutions *••««»**+ 2? Separations of aluminum from interferences . IP Analysis of national Bureau of Standards steels 32 Possible interferences not removed by n&rcury cathode electrolysis 34 , Analysis of National Bureau of Standards brcmses 55 * Analysis of Bstioaal Bureau of standards minerals «••••••.«•«,•*.•> 5 6 * Comparison of Pontechrone Blue Black R with Pon.techro.se Violet SI

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... summary . , , . . -* * -4D pi0Oito:r"ppHic o f b g ro i* • 4& 1. Origin of the problem * 42 Apparatus end reagents 46 « b u o f Q Q w r n m r a {2 } 5* Experimental work ***.♦* * . * . . * * * 48 Am Mtteet or variation of conditions **«.." 48 B* M p m A e i m * of fluorescence on concentretIon of b o r o n ..