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But travertine and all stone of that class can stand injury whether from a heavy load laid upon it or from the weather; exposure to fire, however, it cannot bear, but splits and cracks to pieces at once. This is because in its natural composition there is but little moisture and not much of the earthy, but a great deal of air and of fire.

"What Ryan tried hardest to get," said the architect, "was evenness of lighting. He wanted to bring out clearly the details of the architecture and he succeeded." The Illuminating and the Reflections That motionless steam engine, all in gray, harmonizing with the Travertine, was furiously at work. Into the air it sent clouds of steam that turned to red and blue and green under Ryan's magic.

It is built of travertine, in the form of a double arch, under which a bronze statue of Key is seated. A bronze figure, representing America with an unfolded flag, supports the arch. On the occasion of the unveiling of this statue, the New York Home Journal contained an appreciative criticism of Key as a poet, and the following estimate of his greatest production.

And so he caused a beginning to be made with the great portal of the Castle, after the design of Salustio, the son of Baldassarre Peruzzi of Siena and his architect, and ordained that in that work, which was being executed all in travertine, after the manner of a sumptuous and magnificent triumphal arch, there should be placed in niches five statues, each of four braccia and a half; whereupon Daniello was commissioned to make an Angel Michael, the other statues having been allotted to other craftsmen.

This marble is a calcareous formation deposited from the waters of hot springs, usually in volcanic regions, and is common in the hills about Rome. It often contains the moulds left by leaves and other materials incorporated in the deposit. These account for the corrugations of the stone when it is cut. In California, as in other regions where hot springs are found, travertine is not uncommon.

It forms a sharp contrast with the blue sky and a pleasing topping to the travertine walls. Blue Green, found in the ornamentation of the travertine, and in the darker shades at the bases of the flag poles. These first three colors, all in tones of green, are regarded as one unit in the spectrum of nine colors allowed by Guerin.

At first I suspected that this little mountain had been formed by a jet of calcareous water, a kind of small fountain analogous to the Geiser, which had deposited travertine and continued to rise through the basin flowing from a higher level; but the irregular form of the eminence did not correspond to this idea, and I remained perplexed with the fact and unable to satisfy myself as to its cause.

There are garlands of girls used in the friezes at the base of the minarets, caryatides repeated in the vestibules, and everywhere a wealth of ornamentation suggestive of a bountiful harvest. The brilliancy of design is heightened by the color scheme of green and ivory used upon the lattice work and travertine material. Messrs. Bakewell and Brown of San Francisco are the architects.

So large is the quantity of these eggs, that at a spot where a little stream deposits carbonate of lime, a peculiar kind of travertine is forming which consists of masses of them imbedded in tho calcareous deposit. The flies which produce these eggs are called by the Mexicans "axayacatl" or "water-face."

It was formed by lava ejected from some ancient volcano in the neighbourhood; and over it was deposited, by the action of acidulated waters rising through the volcanic rock, a stratum of travertine or fresh-water limestone.