We present both photometry and spectra of the individual images of the quadruple gravitational lens system Q2237+0305. Comparison of spectra obtained at two epochs, separated by ∼ 3 years, shows evidence for significant changes in the emission line to continuum ratio of the strong ultraviolet CIV λ1549, CIII] λ1909 and MgII λ2798 lines. The short, ∼ 1 day, light–travel time differences between ...