In regard to the soil, several circumstances are very worthy of attention. It is desirable, not only to lower as much as possible the level of the subterranean water (grunawassen) by pipes of deep drainage, the cleansing, and if there is reason, the enlargement (J. Ory) of the capacity of the water collectors, besides covering and keeping in perfect repair the principal ditches in all the secondary valleys to render the lands wholesome, but also to completely drain the ground, diverting the rain water and cultivating the land, in the cultivation of 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 confervæ, 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 confervæ. 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 fever. The miasm in the latter case is therefore endoecic, or more exactly entoichic. With us the propagation of intermittent fever has been observed in persons occupying rooms scoured with unfiltered water containing the Limnophysalis hyalina in great quantity. The following imperial ordinance was published on the 25th of March, 1877, by the chief of admiralty of the German marine. It has for its object the prevention and eradication of infectious diseases: