[57] The Iliad.
Why do you suppose a temple was erected on Mount Etna? (What kind of a mountain is it?)
Wouldn't it be strange if we could make hard coal out of soft? Vulcan does that sometimes with these dike strokes of his.[58]
[58] The International Encyclopedia.
The International will also tell you why dike rock is usually so solid and tough, and what the crystal people have to do with making it so.
The Britannica (28: 188) tells how, in the walls of volcanoes Vulcan wrote out the hint for making re-enforced concrete which is so important a feature of modern architectural engineering.
Look about on the rock-beds in the stone quarry and see if you can't find some of the writing of that Older Cæsar with his queer stone stylus. Probably the men in the quarry will have wondered how these scratches came there and you can tell them.
There is one style of Mr. Glacier's hand-work that even the dogs and the horses notice, and that is the "mirror rocks." Muir tells about them in his "Mountains of California."
CHAPTER XII
(DECEMBER)