This has been
successfully accomplished by the system of overlaying (_comblees_). This
consists in covering the infected soil by thick layers of uninfected
earth, carried there either by the muddy waters of rivers or by the hand
of man. At the same time the steady drainage of the surface and
underground water is provided for. Last year I advised our Minister of War
to undertake in another form a hydraulico-atmospheric purification of the
district of the Janiculum surrounding the Salviati Palace on the Via della
Longara, by draining the soil carefully and covering with a layer of very
close turf all the parts of the surface which could not be macadamized. It
would seem as if this system had been rather successful, since there has
not been this year a single case of fever in the _personnel_ of the new
military college, established in the Salviati Palace; while in the Corsimi
Palace, which is situated on the same side of the Via della Longara, but
which looks out upon that part of the Janiculum which is still uncovered,
there have been some fatal cases of fever.
Furthermore, we have had in Rome, during the past few years, some very
evident proofs of the efficacy of atmospheric methods of purification.
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