Vincey that about half an hour previously, that is to say, at about the time of Mr. Bessel's apparition in Mr. Vincey's rooms, the missing gentleman had rushed out of the gates of the Albany into Vigo Street, hatless and with disordered hair, and had vanished into the direction of Bond Street.

"Do you know that all the furniture is broken in Mr. Bessel's room?" The porter said nothing, but, obeying his gestures, came at once to Mr. Bessel's apartment to see the state of affairs. "This settles it," he said, surveying the lunatic confusion. "I didn't know of this. Mr. Bessel's gone off. He's mad!" He then proceeded to tell Mr.

Vincey did actually see or imagine he saw an apparition of Mr. Bessel standing in his room. He states that the appearance, although brief, was very vivid and real. He noticed that Mr. Bessel's face was white and his expression anxious, and, moreover, that his hair was disordered. For a moment Mr.

Henderson's observations had actual precedence in point of time, but Bessel's measurements were so much more numerous and authoritative that he has been uniformly considered as deserving the chief credit of the discovery, which priority of publication secured him.

Olbers, as already stated, originated in 1812 the view that the tails of comets are made up of particles subject to a force of electrical repulsion proceeding from the sun. It was developed and enforced by Bessel's discussion of the appearances presented by Halley's comet in 1835.

A thing that impressed him instantly, and which weighed upon him throughout all this experience, was the stillness of this place he was in a world without sound. At first Mr. Bessel's mental state was an unemotional wonder. His thought chiefly concerned itself with where he might be. He was out of the body out of his material body, at any rate but that was not all.

Such were Mr. Bessel's exact words as I took them down when he told me the story. Quite forgetful of Mr. Vincey, he remained for a space observing these things. Impelled by curiosity, he says, he stooped down, and, with the shadowy arm he found himself possessed of, attempted to touch a man walking along Vigo Street. But he could not do so, though his finger seemed to pass through the man.

Bessel's so-called "foundation of an Astronomy of the Invisible" now claims attention. His prediction regarding the planet Neptune does not belong to the present division of our subject; a strictly analogous discovery in the sidereal system was, however, also very clearly foreshadowed by him.

From measurements of 200 negatives taken in 1886, he derived for that classic star a parallax of 0·438", in satisfactory agreement with Ball's of 0·468". A detailed examination convinced the Astronomer-Royal of its superior accuracy to Bessel's result with the heliometer.

Hart engaged with a well-known private detective, but as that gentleman accomplished nothing in this case, we need not enlarge upon his proceedings. All that day Mr. Bessel's whereabouts eluded an unceasingly active inquiry, and all that night. And all that day there was a persuasion in the back of Vincey's mind that Mr. Bessel sought his attention, and all through the night Mr.