which those trees, shrubs, and plants should be selected which thrive
the most on marshy grounds and on the shores and paludal coasts of the
sea, and which have their roots most speading and most ramified. Some
of the ordinary grasses are also quite appropriate, but crops of the
cereals, which are obtained after a suitable reformation of marshy
lands, yield a much better return. After the soil in the neighborhood of
the dwellings has been drained and cultivated with care, and in a more
systematic manner than at present, the bottoms of the cellars should be
purified as well as the foundations of the walls and of the houses.

The water intended for drinking, which contains the Limnophysalis
hyalina, should be freed from the fungus by a vigorous filtration. But,
as it is known, the filtering beds of the basins in the water conduits
are soon covered with a thick coating of confervae, and the Limnophysalis
hyalina then extends from the deepest portions of the filtering beds
into the filtered water subjacent. It is for this reason that it is
absolutely necessary to renew so often the filtering beds of the water
conduits, and, at all events, before they have become coated with a
thick layer of confervae. The disappearance of intermittent fevers will
testify to the utility of these measures. It is for a similar reason
that wooden barrels are so injurious for equipages. When the wood has
begun to decay by the contact of the impure water, the filaments of
mycelium of the Limnophysalis hyalina penetrate into the decayed wood,
which becomes a fertile soil for the intermittent fever fungi.

The employment for the preparation of mortar of water not filtered, or
of foul, muddy sand which contains the Limnophysalis hyalina, explains
how intermittent fevers may proceed from the walls of houses. This
arises also from the pasting of wall-paper with flour paste prepared
with water which contains an abundance of the fungi of intermittent