It so happened that at the time I received a request from
the secretary of this society to lecture here this afternoon I was in
the middle of a research connected with dust, which I had been
carrying on for some months in conjunction with Mr. J.W. Clark,
Demonstrator of Physics in University College, Liverpool, and which
had led us to some interesting results. It struck me that possibly
some sort of account of this investigation might not be unacceptable
to a learned body such as this, and accordingly I telegraphed off to
Mr. Moss the title of this afternoon's lecture. But now that the time
has come for me to approach the subject before you, I find myself
conscious of some misgivings, and the misgivings are founded upon this
ground: that the subject is not one that lends itself easily to
experimental demonstration before an audience. Many of the experiments
can only be made on a small scale, and require to be watched closely.
However, by help of diagrams and by not confining myself too closely
to our special investigation, but dealing somewhat with the wider
subject of dust in general, I may hope to render myself and my subject
intelligible if not very entertaining.
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