The Appearance Resembled The Reflection
Of The Moon, Or Some Luminous Body; For The Edges Were
Sinuous From The Undulations Of The Surface.
The ship,
which drew thirteen feet of water, passed over, without
disturbing these patches.
Therefore we must suppose that some
animals were congregated together at a greater depth than
the bottom of the vessel.
Near Fernando Noronha the sea gave out light in flashes.
The appearance was very similar to that which might be
expected from a large fish moving rapidly through a luminous
fluid. To this cause the sailors attributed it; at the
time, however, I entertained some doubts, on account of the
frequency and rapidity of the flashes. I have already
remarked that the phenomenon is very much more common
in warm than in cold countries; and I have sometimes imagined
that a disturbed electrical condition of the atmosphere
was most favourable to its production. Certainly I
think the sea is most luminous after a few days of more
calm weather than ordinary, during which time it has
swarmed with various animals. Observing that the water
charged with gelatinous particles is in an impure state, and
that the luminous appearance in all common cases is produced
by the agitation of the fluid in contact with the atmosphere,
I am inclined to consider that the phosphorescence is
the result of the decomposition of the organic particles, by
which process (one is tempted almost to call it a kind of
respiration) the ocean becomes purified.
December 23rd.
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