of vibration have been added for yellow, etc., up to seven
hundred and thirty millions of millions for the violet, and all
continue in full play, the eye perceives what we call white heat. It
is a simple illustration of the readiness of seeming solids to vibrate
with almost infinite swiftness.

I have been to-day in what is to me a kind of heaven below--the
workshop of my much-loved friend, John A. Brashear, in Allegheny, Pa.
He easily makes and measures things to one four-hundred-thousandth of
an inch of accuracy. I put my hand for a few seconds on a great piece
of glass three inches thick. The human heat raised a lump detectable
by his measurements. We were testing a piece of glass half an inch
thick; and five inches in diameter. I put my two thumbnails at the two
sides as it rested on its bed, and could see at once that I had
compressed the glass to a shorter diameter. We twisted it in so many
ways that I said, "That is a piece of glass putty." And yet it was the
firmest texture possible to secure. Great lenses are so sensitive that
one cannot go near them without throwing them discernibly out of shape.
It were easy to show that there is no solid earth nor immovable
mountains. I came away saying to my friend, "I am glad God lets you
into so much of his finest thinking." He is a mechanic, not a
theologian. This foremost man in the world in his fine department was
lately but a "greasy mechanic," an engineer in a rolling mill.

But for elasticity and mobility nothing approaches the celestial ether.
Its vibrations reach into millions of millions per second, and its
wave-lengths for extreme red light are only .0000266 of an inch long,
and for extreme violet still less--.0000167 of an inch.

It is easier molding hot iron than cold, mobile things than immobile.
This world has been made elastic, ready to take new forms. New
creations are easy, for man, even--much more so for God. Of angels,
Milton says:

"Thousands at his bidding speed,
And post o'er land and ocean without rest."

No less is it true of atoms. In him all things live and move. Such
intense activities could not be without an infinite God immanent in
matter.

THE NEXT WORLD TO CONQUER

Man's next realm of conquest is the celestial ether. It has higher
powers, greater intensities, and quicker activities than any realm he
has yet attempted.

When the emissory or corpuscular theory of light had to be abandoned a
medium for li