The discovery of oxygen, part 1. : experiments / by Joseph Priestley, LL.D. (1775).

  • Priestley, Joseph, 1733-1804.
Date:
1894
Catalogue details

Licence: Public Domain Mark

Credit: The discovery of oxygen, part 1. : experiments / by Joseph Priestley, LL.D. (1775). Source: Wellcome Collection.

    59/64 (page 55)
    more than random conjecture. If we might be allowed to form any judgment from the length of human life in different ages, which seems to be the only datum that is left us for this purpose, we may conclude that, in general, the air of the atmosphere has, for many ages, preserved the same degree of purity. This datum, however, is by no means sufficient for an accurate solution of the problem.