Describing and explaining; tracing the outlines and smoothing out the folds; making clear and making plain; in either case hoping that our hearer may be able to say, “Yes, I see it better now.” Is there really a fundamental difference between these two? Common parlance uses both words for the same kind of process. We may be asked either to “explain” or to “describe” the working of a machine, answering the English boy's question “Why does it do this?” or the Scotch “What's the go of it?” To account for a sum of money is to explain its absence by describing its expenditure. We say, “Why is that man offended?” or, equally, “What's the matter?” and a brief description of the man's character and history, showing on what structure a casual remark has impinged, may lead us to say, “That explains it.” Even where purpose enters we may vary the words we use. “Why on earth did you do that?” “What was your idea in doing that?” “Describe what you had in your mind.” “Please explain”.