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Published online by Cambridge University Press: 15 September 2014
In the introduction a few remarks are made on the growing interest in everything connected with dust, whether it be the organic germs floating in the air, or the inorganic particles that pollute our atmosphere. Professor Tyndall's observations on the dark plane seen over a hot wire are referred to, Lord Rayleigh's recent discovery of the dark plane formed under a cold body is described, and attention called to Dr Lodge's experiments, detailed in a letter to Nature, vol. xxviii. p. 297.
note* page 440 Essays on the Floating Matter in the Air, p. 5, Longmans, Green, & C 1831.
† Nature, vol. xxviii. p. 139
note * page 445 Specimens of these trapped dark planes were shown at the meeting. Some of them made of white powder deposited on blackened glass, others of charcoal deposited on opal glass.
