THE twelfth annual Exhibition of the Royal Meteorological Society was opened on Tuesday evening, March 3, in the rooms of the Institution of Civil Engineers, 24 and 25 Great George Street, Westminster. This year's Exhibition is devoted to rain-gauges and evaporation-gauges, and also such new instruments as have been constructed since the last Exhibition. It might at first be thought that an exhibition of rain-gauges would be a very small and insignificant affair, and would not be of any interest to the general public. Anyone, however, visiting the Exhibition will at once see that a very large collection of various forms of rain-gauges has been got together by the Society, and that the information obtained from the records of these simple instruments is of the highest importance. There are altogether fifty-six different forms of rain-gauges shown in the Exhibition, and it is interesting; to compare the old with the new patterns.