text:  The slag now appeared semi-transparent and so extensively perforated as to show one sheet of liquid fire its waves rising high and pouring over each other in magnificent confusion forming a succession of cascades of unequalled grandeur; the canals now incandescent the restless activity of the numerous vents throwing out great volumes of molten lava the terrible agitation and the brilliancy of the jets which shooting high in the air fell with an echoless lead-like sound breaking the otherwise impressive stillness; formed a picture that language (at least any that I know) is quite inadequate to describe