NICHOLS 



PLATE 1. 



(A) A double reversal in uranyl sulphate at 185 C. 



(B) The fluorescence of uranyl ammonium nitrate at 185jC. 



(C) The polarized fluorescence and absorption of uranyl caesium chloride at 185 C. 

 Photographic reproductions from the original spectrographs by Dr. R. C. Rodgers. 



