the finest cambric needle. I will take upon the point of it an
invisible portion of the substance I speak of." Here he carefully
picked out a pill from the basin, and as carefully placed it upon the
table, where he detached an infinitesimal atom of it and held it up on
the point of the needle. "This particle," he said, "is so small that it
cannot be seen except with the aid of a microscope. I will now place
needle and all on the machine and touch it off with electric current;"
and as his hand hovered over the push-button there were cries of
"Stop! stop!" but the finger descended, and instantly there was a
terrific explosion. The very foundation seemed shaken, and a dense
cloud of smoke rolled over the heads of the audience. As the Professor
became visible through the thinning smoke, he looked around for his
audience. Every man was under the benches, and groans came from all
parts of the hall. "I hope," said the Professor, in anxious tones,
"that no one has been hurt. I am afraid that I took up too much of the
substance on the point of the needle, but it will enable you to imagine
the effect of a larger quantity. Pray seat yourselves again. This is my
last experiment."

As the audience again seated itself, another mutual sigh ascended to
the roof. The Professor drew the chairman's chair towards him and sat
down, wiping his grimy brow.

A man instantly arose and said, "I move a vote of thanks to Professor
Slivers for the interesting----"

The Professor raised his hand. "One moment," he said, "I have not quite
finished. I have a proposal to make to you. You see that cloud of smoke
hovering over our heads? In twenty minutes that smoke will percolate
down through the atmosphere. I have told you but half of the benefits