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"De most monstrous disproportionately extradition ob circumstantial occurrances dat ever transpositioned on my optical vasionariness!" he exclaimed as he laid his gun and the black box carefully down on the sand. "Ten thousand naked imps of darkness swarmin' ober de ship an' not a pusson to say what dey ought to do an' where dey ought t' go! It am suttinly terrible!"
They saw the Fenachrone cruiser lying in wait for the two globular vessels. Looking through an extraordinarily powerful telescope with the eyes of their prisoner, they saw them approach, all unsuspecting. DuQuesne recognized all five persons in the Skylark and Dunark and Sitar in the Kondal; such was that unearthly optical instrument and so clear was the impression upon the mind before him.
If we must compare the eye to an optical instrument, we ought in imagination to take a thick layer of transparent tissue, with a nerve sensitive to light beneath, and then suppose every part of this layer to be continually changing slowly in density, so as to separate into layers of different densities and thicknesses, placed at different distances from each other, and with the surfaces of each layer slowly changing in form.
There is a real and very definite limit to optical discovery among the stars a limit whose nature need only be stated to be understood. If, indeed, the casting of large lenses were all that is required, man's ingenuity would ultimately prove equal to the task, and we might have them of any size demanded.
Where my discernment, aided by reason and my optical contrivances, fails, the insect, guided by the wands of its antennae, never blunders. Its choice is made. See it unsheathing its long instrument. The probe points normally towards the surface and occupies nearly the central spot between the two middle-legs.
The diorama, a recent invention, which carried an optical illusion a degree further than panoramas, had given rise to a mania among art students for ending every word with rama. The Maison Vauquer had caught the infection from a young artist among the boarders. "Well, Monsieur-r-r Poiret," said the employe from the Museum, "how is your health-orama?"
Think of such an organ as the eye, that most perfect of optical instruments, as so produced in the lower animals and perfected in the higher! A friend of ours, who accepts the new doctrine, confesses that for a long while a cold chill came over him whenever he thought of the eye.
This same sun which seems so enormous compared to our globe is nothing more than an atom in immensity. What you call stars are other suns like ours, surrounded by planets like our earth, but which are invisible on account of their small size. How many are they? Man brings his optical instruments to perfection and is able to pierce further into the fields of heaven, discovering ever more and more.
We come now to an instrument that does not depend upon optical means for detecting errors of surface, namely, the spherometer, which as the name would indicate means sphere measure, but it is about as well adapted for plane as it is for spherical work, and Prof.
The discovery of the inner or crape ring of Saturn, made simultaneously in 1850 by William C. Bond, at the Harvard observatory, in America, and the Rev. W. R. Dawes in England, was another interesting optical achievement; but our most important advances in knowledge of Saturn's unique system are due to the mathematician.
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