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Little had we thought that our careful efforts at concealment had been so easily seen through, with never a word to show us that they saw. They had followed up words of ours on the science of optics, asked innocent questions about glasses and the like, and were aware of the defective eyesight so common among us.
Now that we have realized that it is inadmissible to speak of light as consisting of single rays, or to ascribe to it a finite velocity, the concept of the refraction of light, as understood by optics to-day and employed for the explanation of the spectrum, also becomes untenable. Let us find out what we must put in its place.
During his tenure of this chair he pub. two mathematical works of great learning and elegance, the first on Geometry and the second on Optics. In 1669 he resigned in favour of his pupil, Isaac Newton, who was long considered his only superior among English mathematicians. About this time also he composed his Expositions of the Creed, The Lord's Prayer, Decalogue, and Sacraments.
The invention of the Nicol prism was a great step in practical optics, and quite recently such prisms have been constructed of a size and purity which enable audiences like the present to witness the chromatic phenomena of polarized light to a degree altogether unattainable a short time ago. William Spottiswoode, and they were manufactured by Mr. Colours of Films of Selenite in Polarized Light.
The most useful tools, clothing, and ornaments of every sort were provided for them; even the most particular inventions in optics, chemistry, and natural philosophy were contributed for their advantage, or to promote their pleasure." Certainly if M. Baudin failed it would not be the fault of the First Consul.
As soon as they could they left the table, and Tobey, observing their uneasiness in spite of his damaged and nearly useless optics, decided to send them to another room where they could pass the afternoon without further annoyance. Stubby escorted the party and ushered them into a good sized room which he said was "Algy's study," although no one ever studied there.
On the other hand, the abode of the Wild Duck in the play of that name is a conception entirely consonant with the optics of the theatre; for no detail at all need be, or ought to be, visible, and a vague effect of light is all that is required.
They were not without some knowledge of optics. The convex lens found at Nimroud shows that they were not unacquainted with magnifying instruments. In arithmetic they had detected the value of position in the digits, though they missed the grand Indian invention of the cipher. What a spectacle for the conquering Greeks, who, up to this time, had neither experimented nor observed!
Some faint idea of that part of physics, called optics, which NEWTON illuminated, by his genius and experience, are sufficient for conceiving the manner in which these appearances are produced, though they require instruments and particular care to give them proper effect."
I closed my optics, as ordered, although my name is not Higgins, and I didn't like to have even Jupiter so dub me. "Now open them again," was the sharp order. I did so, and lo and behold! by some supernatural power we had been transported back to the club-house.
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