Read it through once

Abominable are the tumblers into which he pours his poison. Though true cylinders without—within, the villanous green goggling glasses deceitfully tapered downwards to a cheating bottom. Parallel meridians rudely pecked into the glass, surround these footpads’ goblets. Fill to _this_ mark, and your charge is but a penny; to _this_ a penny more; and so on to the full glass—the Cape Horn measure, which you may gulp down for a shilling.