Published online by Cambridge University Press: 06 July 2012
In the two papers previously communicated to this Society under the above title, Parts I. and II., I have given the results of my observations on the dust in the atmosphere for the years 1889 and 1890. In this paper will be given the results of similar observations I have been able to make during the years 1891, 1892 and 1893. The observations made during these last three years are similar to those made in the two previous ones; and were mostly made at the same places and at about the same dates as those already given. These five sets of observations are therefore comparable with each other, and give a fair statement of the number of dust particles in the atmosphere at the different places at the particular dates.
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