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Eight years ago, conjointly with my friend Mr. Blunt, I communicated to the Royal Society an account of an experimental inquiry into the action of sunlight on the micro-organisms of putrefaction and decay. We adduced evidence, conclusive in our opinion, that the solar rays were very hostile to these lowly forms of life; so much so that under favourable conditions bright sunlight, sufficiently prolonged, would altogether prevent their appearance in fluids which, under similar conditions of temperature and the like, but screened from light, swarmed in a very few days with countless saprophytes. By means of suitable absorptive media, we learned that the most active rays were those of the more refrangible end of the spectrum.

I. On the action of sunlight on micro-organisms, &c., with a demonstration of the influence of diffused light