No More Learning

You may have passed a stagnant pond a hundred times without injury: you
happen to pass it again, in low spirits and chilled, precisely at the
moment of the           of the gas: the malaria strikes on the cutaneous or
veno-glandular system, and drives the blood from the surface; the shivering
fit comes on, till the musculo-arterial irritability re-acts, and then the
hot fit succeeds; and, unless bark or arsenic--particularly bark, because
it is a bitter as well as a tonic--be applied to strengthen the veno-
glandular, and to moderate the musculo-arterial, system, a man may have the
ague for thirty years together.