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.

    43/138 (page 25)
    ( ) ceafes for fome time, the excitability accumulates, or becomes more capa- ble of receiving their actions. The lecond law is, that when the exciting powers have adted with vio- lence, or for a conliderable time, the excitability becomes exhaufted, or lefs fit to be adted on, and this we fhall be able to prove by a fimilar induction. Let us take the effedts of light upon the eye ; when it has adled violently for fome time upon the optic nerve, it diminifhes the excita- bility of that nerve, and renders it incapable of being afFedted by a quantity