those who take an interest in such matters, it need scarcely be
reproduced in this connection, more particularly as, just when
the professor was getting fairly warmed up to his work, an
interruption came in the shape of a sharp, eager shout from the
lips of Waldo Gillespie.

"Look--look yonder! What a funny looking cloud that is!"

A small clump of trees growing upon a rising bit of ground
interfered with the view of his brother and uncle, for Waldo was
pointing almost due southeast; yet his excitement was so
pronounced that both the professor and Bruno hastened in that
direction, stopping short as they caught a fair sight of the
object indicated.

A mighty mass of wildly disturbed clouds, black and green and
white and yellow all blending together and constantly shifting
positions, out of which was suddenly formed a still more ominous
shape.

A mass of lurid vapour shot downwards, taking on the general
semblance of a balloon, as it swayed madly back and forth, an
elongating trunk or tongue reaching still nearer the earth, with
fierce gyrations, as though seeking to fasten upon some support.

Not one of that trio had ever before gazed upon just such another
creation, yet one and all recognised the truth,--this was a
veritable tornado, just such as they had read in awed wonder
about, time and time again.