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202 NATURAL HISTORY OF GEMS.
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Artibus
Romanorum,' probably in the seventh century, in a barbarous and often
unintelligible jargon. However, if wo choose to believe his assertion,
" Nil tibi scribo quidem quod non prius esse probassum,"
the
following recipe would decide the question :—" Collect fat earth-worms
as turned up by the plough, vinegar, and the hot blood out of a big
he-goat fed on strengthening herbs ; mix all together, and so anoint
the bright shining bowl, and then engrave upon it with fragments of the
hard stone called Pyrites." This was the method, as he prefaces,
directed by the art. (See Vitrum.)
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