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, Macon 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 Solaria of the Italian Navy, at whose disposal the ship Carlo Alberto 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 electromagnetic waves, and that consequently a greater force is required to produce a given result by day than