Answer.—Place it across the door-sill, and let one stand upon it in the entry. Then close the door, and ask the other to step upon the other end in the room, and neither can see nor touch the other, for the door prevents.
THE COW PUZZLE.
Tell the company that seven cows were walking in a straight line into a narrow door, and say to them, "If you should ask the last cow, 'How many pairs of horns are before you?' what would she reply?"
Some will answer, "One pair," and some, "Seven pairs," but after puzzling them for a while, you can reply, "In the opinion of most scientists, she would not say anything, for she could not speak, poor thing!"
ANOTHER COW PUZZLE.
Draw a square with a lead-pencil, and say, "Suppose this field was inclosed with walls fifty feet high, without opening or possibility of digging under, and a cow was in there, how could you get it out?"
Answer.—Rub it out.