our hours, is apt to contract an offensive moisture. But Captain
Cook was not satisfied with ordering upon deck the hammocks and bedding
every day that was fair (the common method) but took care that every
bundle should be unlashed, and so spread out, that every part of it might
be exposed to the air.

His next concern was to see to the purity of the ship itself, without
which attention all the rest would have profited little. I shall not
however detain you with the orders about washing and scraping the decks,
as I do not understand that in this kind of cleansing he excelled others;
but since our author has laid so great a stress upon _Fire_, as a
purifier, I shall endeavour to explain the way of using it, more fully
than he has done in his Paper. Some wood, and that not sparingly, being
put into a proper stove or grate, is lighted, and carried successively to
every part below deck. Wherever fire is, the air nearest to it being
heated becomes specifically lighter, and by being lighter rises, and
passes through the hatchways into the atmosphere. The vacant space is
filled with the cold air around, and that being heated in its turn, in
like manner ascends, and is replaced by other air as before. Thus, by
continuing the fire for some time, in any of the lower apartments, the
foul air is in a good measure driven out, and the fresh admitted. This is
not all: I apprehend that the acid steams of the wood, in burning, act
here as an antiseptic and correct the corrupted air that remains.

An officer of distinguished rank, another of Captain Cook's experienced
friends, mentioned to me a common and just observation in the fleet,
which was, that all the old twenty-gun ships were remarkably less sickly
than those of the same size of a modern construction. This, he said, was
a circumstance he could not otherwise account for, than, by the former
having their _galley_* in the fore-part of the _orlop_**, the chimney
vented so ill, that it was sure to fill every part with smoke whenever
the wind was a-stern. This was a nuisance for the time, but, as he
thought, abundantly compensated by the extraordinary good health of the
several crews. Possibly those fire-places were also beneficial, by drying
and ventilating the lower decks, more when they were below, than they can
do now that they are placed under the fore-castle upon the upper deck.

[* Their fire-place or kitchen.]

[** The deck immediately above the hold.]

But the most obviou