I remember distinctly, during the summer of 1901, at Les Andelys-on-Seine, that upon two days and for two hours in the afternoons of those days all Nature, animate and inanimate, bore the aspect of things seen under a strong glare of violet light, exactly as though a tinted glass were suspended between the sun's rays and the earth. The effect was most curious and disturbing. Nature appears to be toneless and flat. Highlights and shadows are attenuated almost to extinction, whilst in this dull purple glare the heat became more intense than ever, possibly through lack of wind, for all was still.