the putrid Effluvia are evaporated and
dispersed, and the Water becomes sweet in a very short Time.

The Men ought to be brought upon Deck, and Roll called two or three
Times a Day; they should be made to comb their Hair, and wash their
Hands and Face every Day, and to shift themselves sometimes, if
possible; and in every respect keep themselves as clean as the Nature
of the Service will admit; and proper Exercises should be contrived,
to keep them in Health.

All the Parts of the Ship ought to be kept very neat and clean; and
the Hold, and all between Decks, ought to be scraped and swept daily;
and every Morning, in fair Weather, ought likewise to be washed, and
afterwards sprinkled or washed with warm Vinegar, while the Men are
upon Deck[130].

[130] This ought always to be done in the Morning, that all
the Parts of the Ship may have Time to dry before the Men go
to rest in their Births at Night; but it ought never to be
done after Sun-set.

When the Weather will permit, Fires of dried Wood may be lighted in
Iron Kettles between Decks, and Centinels set over them, and the Fires
sprinkled with Rosin or Bits of Rope dipt in Tar, or with some cheap
Aromatic; and these Fires may be carried into all the Parts of the
Ship that Safety will permit, in order to dry and purify the Air[131].
After this Operation all the Ports and Hatchways should be opened,
and the Air in all the Parts of the Ship often renewed by working the
Ventilators.

[131] It has been proposed, that the Air in Ships of War
should be purified in this Way both by Dr. _Lind_ and by
Mons. _de Hamel de Monceau_.

The Mens Hammocks and Beds ought to be brought up upon Deck in fair
Weather, and well aired, and afterwards put in their Places, and Fires
lighted below Decks.

When Troops, sent on an Expedition into warm Climates, arrive at the
Place of their Destination, particular Care should be taken to guard
them against the Diseases peculiar to such Climates, which are
different from those common to our more northern Latitudes.

Dr. _Lind_ says, that People coming first from a cold into a hot
Climate are apt to have plethoric Symptoms; a Pain of the Head,
Giddiness, a Sense of Weight, and Fulness of the Breast, and a slight
Inflammation of the _tunica conjunctiva_; and that some are apt to be
seized with ardent Fevers and Diarrhoeas. And all Practitioners have
observed, that New-Comers into warm Climates are at first li