A lecture on the preservation of health / By T. Garnett.

  • Thomas Garnett
Date:
1800
Catalogue details

Licence: Public Domain Mark

Credit: A lecture on the preservation of health / By T. Garnett. Source: Wellcome Collection.

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    quantity of light that would at other times afFedt it. When you have been walking out in the fnow, if you come into your room, you will fcarcely be able to fee any thing for fome mi- nutes. Look ftedfaftly at a candle for a minute or two, and you will with difficulty difcern the letters of a book, which you were before read- ing diftindtly ; and if you happen to caft your eyes upon the fun, you will not fee any thing diftinctly for fome time afterwards. Let us next conlider the matter of heat: fuppofe water to be heated luke-