The absorption spectrum of hexagonal

{S m (C_{2} H_{5} S O_{4})}_{3}

·9

H_{2}

O has been investigated in the temperature range 20° to 295°K. It is found to be simpler than that of the monoclinic Sm

{Cl}_{3}

·6

H_{2}

O previously reported. This is in agreement with theoretical conclusions that the greater symmetry of the hexagonal lattice should give rise to crystalline fields which would cause the energy levels of

{Sm}^{+ + +}

ion to be split apart less and to be in some cases more degenerate than would the more unsymmetrical monoclinic lattice. The ethylsulfate lines seem to be related chiefly to three lower levels, the basic one and two which are located higher on the energy scale by 55 and 65

{cm}^{- 1}

, respectively. Complete figures are given for the ethylsulfate absorption in the visible region. In addition results for the iodide and perchlorate of samarium are summarized. The lower levels found to be most important in these salts are situated at 0, 90, 107

{cm}^{- 1}

for the iodide; and 0, 104, 160

{cm}^{- 1}

for the perchlorate.

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