"Three ounces rosium oxyde.
"One ounce chlorate strontium.

"You will then, within twenty-four hours, set out with the
stenographer and the supplies mentioned and join me in camp on
Little Sprite Lake. This order is formal and admits of no
delay. You will appreciate the necessity of absolute and
unquestioning obedience when I tell you that I am practically
on the brink of the most astonishing discovery recorded in
natural history since Monsieur Zani discovered the
purple-spotted zoombok in Nyanza; and that I depend upon you
and your zeal and fidelity for success.

"I dare not, lest my letter fall into unscrupulous hands,
convey to you more than a hint of what lies before us in these
uncharted solitudes of the Everglades.

"You must read between the lines when I say that because one
can see through a sheet of glass, the glass is none the less
solid and palpable. One can see _through_ it--if that is also
seeing it; but one can nevertheless hold it and feel it and
receive from it sensations of cold or heat according to its
temperature.

"Certain jellyfish are absolutely transparent when in the
water, and one can only know of their presence by accidental
contact, not by sight.

"_Have you ever thought that possibly there might exist larger
and more highly organized creatures transparent to eyesight,