hall, with draught and ventilation, is set apart for precipitations by
sulphureted hydrogen and the preparation of chlorine and other
ill-smelling and deleterious gases. The great amount of light and
space provided secure the best of conditions of hygiene to this fine
and vast laboratory, where young people have all the necessary
requisites for becoming true chemists.--_La Nature._

* * * * *




DUST-FREE SPACES.[1]

[Footnote 1: Lecture to the Royal Dublin Society by Dr. Oliver J.
Lodge, April 2, 1884.]


Within the last few years a singular interest has arisen in the
subject of dust, smoke, and fog, and several scientific researches
into the nature and properties of these phenomena have been recently
conducted. 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