tried to worrit that electricity into my brain for many months, off an' on, and I do believe as I 'm more muddled about it to-night than I was at the beginnin'."
"P'raps it 's because you hain't got no brains to work upon," suggested Slagg.
"P'r'aps it is," humbly admitted the seaman. "But look here, now, doctor," he added, turning to Sam with his brow knotted up into an agony of mental endeavour, and the forefinger of one hand thrust into the palm of the other,—"look here. You tells me that electricity ain't a substance at all."
"Yes, that 's so," assented Sam with a nod.
"Wery good. Now, then, if it ain't a substance at all, it's nothin'. An' if it's nothin', how can you go an' talk of it as somethin' an' give it a name, an' tell me it works the telegraph, an' does all manner of wonderful things?"
"But it does not follow that a thing must be nothing because it isn't a substance. Don't you see, man, that an idea is something, yet it is not a substance. Thought, which is so potent a factor in this world, is not a substance, yet it cannot be called nothing. It is a condition—it is the result of brain-atoms in action. Electricity is sometimes described as an 'invisible imponderable fluid,' but that is not quite correct, because a fluid is a substance. It is a better definition to say that elec-
