"But there is no 'next day,'" interrupted Watson. "I entirely agree with Horn." He had been listening to the discussion with silent interest. "No next day like the one on which you began your canvas. The sky is different--gray, blue, or full of fleecy, sunny clouds. Your shadows are more purple, or blue or gray, depending on your sky overhead, and so are your reflections. If you go on and try to piece out your sketch, you make an almanac of it--not a portrait of what you saw. I can pick out the Mondays, Tuesdays, and Wednesdays on that kind of a sketch as soon as I see it. Nature is like a bird--if you want to surprise her, you must let go both barrels when she rises; if you miss her at your first shot you will never have another chance--not at that particular bird." "Well, but suppose you DO happen to have two days alike," insisted Waller. "I have seen thirty days on a stretch in Venice without a cloud. What then?" The bird simile had evidently not appealed to the great critic. "Then ten chances to one you are not the same man you were the day before," replied Watson, calmly, laying down his pipe. "You have had bad news from home or your liver is out of order, or worse still, you have seen some new subject which has taken hold of you and your first enthusiasm has oozed away. If you persist in going on you will either undo what you did yesterday or you will trust to your memory of what you THINK yesterday was, to finish your sketch by. The first fills it full of lies and the second full of yourself; neither have anything to do with nature. Four hours, Waller, not a minute more. You'll come to it before you die." "That depends on what you have got to paint with," snapped out Jack Bedford, who was trying to clean a dingy-looking palette with a knife. "Whose dirt-dump is this, anyhow?" and he held it up to view. "Might as well try to get sunlight out of powdered brick. Look at that pile of mud," and he pointed to some dry color near the thumb-hole. "Which palette?" came a voice. Jack held it up for the inspection of the room. "Oh, that's Parker Ridgway's," answered Fred. "He was here the other day and made a half-hour's sketch of a model I had." The announcement of Ridgway's name was greeted with shouts of laughter. He was a society painter of the day, pupil of Winterhalter and Meyer von Bremen, and had carried off more portraits and at higher prices than all the other men put together. "Keep on! keep on! Laugh away," grumbled Waller squeezing a tube of Prussian blue on his palette. "When any one of you fellows can get $4,000 for a season's work you can talk; until you do, you can keep your mouths shut as tight as Long Island clams." "Who got it?" "The Honorable Parker Ridgway, R.A., P.Q., and I don't know but X.Y.Z.," roared Waller. "I'd like to know how?" asked Watson, reaching over Fred's arm for the bottle of turpentine. "That's what he did," snapped out Waller. "Did what?" "Knew how."