better name, we call occult phenomena require for their explanation?

Before passing on to the more practical generalizations to be drawn from
the suggestions contained in this chapter, I may advert to an objection
sometimes brought by the sceptical in this matter. They say: "How is it
that apparitions are always seen in the dark?" and then they answer
their own question by saying, it is because superstitious people are
nervous in the dark and imagine all sorts of things. Then they laugh and
think they have disposed of the whole subject. But it is not disposed
of quite so easily, for not only are there many well attested cases of
such appearances in broad daylight, but there are also scientific facts,
showing that if we are right in explaining such happenings by etheric
action, such action is more readily produced at night than in the
presence of sunlight.

In the early part of 1902 Marconi made some experiments on board the
American liner _Philadelphia_, which brought out the remarkable fact
that, while it was possible to transmit signals to a distance of fifteen
hundred miles during the night, they could not be transmitted further
than seven hundred miles during the day. The same was found to be the
case by Lieutenant Solari of the Italian Navy, at whose disposal the
ship _Carlo Alberta_ was placed by the King of Italy in 1902, for the
purpose of making investigations into wireless telegraphy; and summing
up the points which he considered to have been fully established by his
experiments on board that ship, he mentions among them the fact, that
sunlight has the effect of reducing the power of the electro-magnetic
waves, and that consequently a greater force is required to produce a
given result by day than by night. Here, then, is a reason why we might
expect to see more supernatural appearances, as we call them, at night
than in the day--they require a smaller amount of force to produce them.