Observations on the Diseases of SeamenBlane, Gilbert, Sir
History
Observations on the Diseases of Seamen
Blane, Gilbert, Sir
Medicine, Naval -- Early Works To 1800; Sailors -- Diseases
It may be proper here to introduce a general account of the seasons
and temperature of the West Indies, as there will be frequent occasion
hereafter to make allusions to them. With regard to the heat, though
the range of the temperature is very small, in comparison of what it
is in Europe, the variations follow the same seasons; for July and
August are the hottest months, and December and January the coolest.
This we would naturally expect, as our plantations lie all in the
northern hemisphere, between the 10th and 20th degree of N. latitude,
and therefore bear the same relation as Europe does to the sun’s
annual course. The hurricanes happen in the same season in which the
periodical rains chiefly fall, that is, in the months of August,
September, and October, which are called the hurricane months, and
this is also the most unhealthy season. The time of the year which is
most apt to be rainy, next to this, is from the middle of May to the
middle or end of June, but this is not invariable. The lowest I ever
observed the thermometer was at 69°; it stands very commonly at 72° at
sunrise, in the cool season, rising to 78° or 79° in the middle of the
day. In the hot season, the common range is from 76° to 83°. It seldom
exceeds this in the shade at sea; and the greatest height at which I
ever observed it in the shade at land was 87°. This is far short of
the extremes of heat which they experience at certain seasons on the
continent of North America, even very far north. In Pennsylvania and
New York, the thermometer, I have been assured, rises frequently above
90°. It does so commonly enough in the East Indies; but I believe it
never was known to rise so high in the West Indies, so that the heat,
comparatively speaking, may be called moderate and steady.
The comparative mortality in June is small, owing to the fleet’s having
been cleared of all the bad cases at Barbadoes before it sailed from
thence. Though the proportion of sick in July is less, that of the
mortality is greater, (see Table II.) which seems to be owing to this
circumstance, that the cases taken ill during the rainy weather of June
did not terminate fatally till the succeeding month.
In the course of this summer the fleet was reinforced by several ships
of the line from England. The Triumph arrived in May, without any sick
on board; but a flux prevailed a few weeks afterwards, without any
evident cause, except the influence of the climate, and the exposure
and fatigues during the operations of May. The disease, however, soon
subsided, and the ship being kept in excellent order and discipline,
continued healthy during all the remaining time in which she served
with us.
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