Magnetic-susceptibility measuxements have been used to locate the low-lying crystal-field levels of SrClo. Yb '. The two upper levels arising from the crystal-fieM-split E5g2 manifold were located by optical-absoxption spectra. The five crystal-field levels were found to lie at 0, 155, 650, 10193, and 10612 cm . A theoretical analysis showed that the magnetic-susceptibility, optical-absorption, and electron-spin-resonance data couM not be corxelated without the use of second-order cxystal-field mixing. In spite of the reasonably good correlation among the three experiments, the analysis, which was based on an electxostatic model, did give some unexpected le8ults fol" some of the mole 1mpox'tant physical quantltlea, This may indicate the importance of covalency and overlap in this cxystal system similar to that already found for Caw, :Tm".