| Description | Harrison is afraid that as Wallace's request covers so wide a field of inquiry, it will not be possible to do more than indicate some sources of reference. Lord Rayleigh & R W Wood's paper consults Proceedings of the Royal Society indexes for the past 20 years, also the Philosophical [Imagique], and the Proceedings of the Physical Society of London, then there are the lectures at the Royal Institution, also Wallace should look up the article "Diffusion in flight" in the Encyclopaedia Britannica.
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