(_a_) Draw a horizontal line 6 or 8 inches long. An inch or two above it draw a horizontal line about an inch long parallel to the first. Say, "The long line represents the perfectly level ground of a field, and the short line represents a cannon. The cannon is pointed horizontally (on a level) and is fired across this perfectly level field." After it is clear that these conditions of the problem are comprehended, add, "Now, suppose that this cannon is fired off and that the ball comes to the ground at this point here (pointing to the farther end of the line which represents the field). Take this pencil and draw a line which will show what path the cannon ball will take from the time it leaves the mouth of the cannon till it strikes the ground." (_b_) Say, "You know, of course, that water holds up a fish that is placed in it. Well, here is a problem: Suppose we have a bucket which is partly full of water. We place the bucket on the scales and find that with the water in it it weighs exactly 45 pounds. Then we put a 5-pound fish into the bucket of water. Now, what will the whole thing weigh?" If S. responds correctly, say, "How can this be correct, since the water itself holds up the fish?" (_c_) "You know, do you not, what it means when they say a gun 'carries 100 yards?' It means that the bullet goes 100 yards before it drops to amount to anything." When this is clear, proceed, "Now, suppose a man is shooting at a mark about the size of a quart can. His rifle carries perfectly more than 100 yards. With such a gun is it any harder to hit the mark at 100 yards than it is at 50 yards?" Credit if two of the three problems are satisfactorily solved. For (_a_), line must begin almost on a level and drop more rapidly toward the end. For (_b_), S. must adhere positively to right answer. For (_c_), S. must know that a small deviation at 50 yards becomes a larger deviation at 100 yards. (See _The Measurement of Intelligence_, pp. 333-36 for important scoring rules.) Year XVIII 1. _Vocabulary_ See last section. 75 satisfactory definitions if both lists are given; 38 if only one list is given. 2. _Paper-Cutting Test_ When this test is given it should precede XIV 2. Take a piece of paper about 6 inches square and say, "Watch carefully what I do. See, I fold the paper this way (folding it once over in the middle). Then I fold it this way (folding it again in the middle, but at right angles to the first fold). Now, I will cut out a notch right here" (indicating). Cut notch, keeping fragments out of view. Leave folded paper exposed, but pressed flat against table. Then give S. a pencil and a second sheet of paper like the one already used and say, "Take this piece of paper and make a drawing to show how the other sheet of paper would look if it were unfolded. Draw lines to show the creases in the paper and show what results from the cutting." Do not permit S. to fold second sheet, and do not say, "draw the holes."