Though usually adroit enough where her own interests were concerned, she made the mistake, not uncommon to persons in whom the social habits are instinctive, of supposing that the inability to acquire them quickly implies a general dulness. Because a bluebottle bangs irrationally against a window-pane, the drawing-room naturalist may forget that under less artificial conditions it is capable of measuring distances and drawing conclusions with all the accuracy needful to its welfare...