Plate 39, Fig. 74, an experiment with Gold chloride carried out at noon on an Easter Sunday and on the same Plate,Fig. 75 is the reproduction of the experiment carried out the same year on the 25thDecember at Midnight. Both experiments are beautiful, but completely different in colour and form, although the experiments are made with the same concentration of Gold chloride, the same filter paper is used, they are carried out in the same room under identical conditions. The night experiment at Easter is insignificant, and the day experiment at Christmas is insignificant.