On the rear side of the back room was a window. A few feet from this window part of a load of sawdust lay upon the ground. Here the sheriff found several footprints. "How long has this sawdust been here?" he called out to Mr. Rexford. "It was put there several days ago," he replied. "I wish you would look here. I have made an important discovery." The merchant quickly approached the spot. "Do you see those footprints? When do you think they were made?" "Last night about dark I shoveled up several basketfuls and carried them into the stable. These tracks must have been made since then." "Do you feel sure of this?" "I do, and I notice the prints point exactly to where the back window was." "That is a good point, sir; but do you notice that whoever made that track must have had a small foot?" "Yes, I see it is small, and that goes to strengthen my suspicions." "It measures ten inches long and three wide," said the sheriff, applying his rule to the footprint. In about an hour from this time Sheriff Coombs entered the woolen factory, and a minute or two later went to the flockers. "Do you want to see me?" asked Fred, as he saw the officer fasten his eyes on him. "Yes; I have a warrant for your arrest." "For my arrest!" exclaimed Fred in amazement. "What for?" "On complaint of John Rexford, for setting fire to his store," replied the sheriff, in a pompous manner. XIX. Fred stared at the sheriff in blank amazement at the terrible charge now brought against him. "I am charged with setting fire to John Rexford's store?" he repeated. "Yes." "And you say Mr. Rexford makes the charge?" demanded Fred, in great excitement. "Yes, he makes the charge," replied the officer, in a manner that was extremely irritating to our young hero. "I don't know what it means," answered Fred. "You know the store was burned, I suppose?" said the sheriff sarcastically. "I do, sir; but what has that to do with me?" "The question is one that must be answered by the court. My duty is to see that you appear there for trial." "When will the trial be?" asked Fred, pale and depressed. "At two o'clock this afternoon you must appear before Justice Plummer." "Can I remain at work till then?" "No; you must go with me." "Is it necessary for me to go to the lockup?" asked Fred, shrinking with natural repugnance from such a place. "It is, unless you can furnish surety for your appearance at the trial." "If I promise to be there, isn't that enough?" "I should not be doing my official duty to let you off on your promise," answered the sheriff. "I would rather stay with you until two o'clock than go to the lockup." "My time is worth too much to waste. I have a great deal of official business to attend to," said the officer; and after a pause, he added, "But if you were to give me five dollars, cash down, I think I could fix it for you." "I haven't so much money with me, but I promise to pay it to you." "I should prefer the cash."