George Simmons, A British Rifle Man
“ The river Guadiana passes for a great way through a flat country, whose banks in the rainy season are overflowed; consequently when the river diminishes from dryness and the heat of the weather, its banks become impregnated with myriads of vermin and also with vegetable matter in a state of putrefaction. In every stagnant pool these exhalations poison the surrounding atmosphere with pestilential vapours. ”
