Abstract
WE had the sunset display again to-night, but the after-glow was much less prolonged, suggesting that the stratum of dust and crystals is slowly settling down. But repeated flashes of lightning and peals of thunder, in a place where storms, at the usual time of year for them, are very infrequent, seem to suggest also the question whether the ash is not brought within the sphere of rain-clouds rather by loss of electricity than the influence of surface-gales. At the same time the large fluctuations of pressure seem to tell, on the contrary, that the whole column is affected to unusual altitudes. Since I have been a reader of journals I have seen nothing more enthralling in its interest than the contributions made, week by week, to NATURE on this subject from all parts of the world. It marks an era in observation from which we may hope great things in the future.
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