X. Repeat experiment I., but let the Od-subject be a double row of five sovereigns, each disposed longitudinally from you, and hold the odometer over the middle of the double row of sovereigns. _Result_—Longitudinal oscillations, but the excursions are inordinately long. Still, on touching the forefinger with the thumb, the oscillations become either transverse, or the odometer moves in an ellipse, of which the long axis corresponds with the axis of the double line of sovereigns. XI. Dispose ten sovereigns longitudinally from you in two parallel rows, an inch and a half apart, and hold the odometer over the middle of the interval. _Result_—Longitudinal oscillations. XII. Modify experiment XI. by holding the odometer not midway, but nearer one of the rows of sovereigns. _Result_—Oblique oscillations. XIII. Dispose ten sovereigns heaped in a short longitudinal group, and hold the odometer over the table half an inch to one side of the middle of the heap. _Result_—Transverse oscillations. From the latter experiments and their modifications, it became evident that the magnitude and shape of the Od-subject have each a direct influence on the result. A greater force of attraction evidently exists towards the greater mass. XIV. Odometer held over the northward pole of a magnetic needle contained in a compass-box under glass. _Result_—Rotatory motion in the direction of the hands of a watch. XV. Odometer held over the southward pole. _Result_—Rotatory motion in the direction contrary to the motion of the hands of a watch. XVI. Repeat experiments XIV. and XV., with the difference of touching the forefinger implicated in the odometer with the thumb of the same hand. _Results_—The rotatory motions observed in the two experiments referred to become exactly reversed. XVII. Hold the odometer over the centre of the needle. _Result_—Oscillations at right angles, or transverse, to the axis of the needle. XVIII. Hold the odometer over, and half an inch to one side of, the centre of the needle. _Result_—Oscillations parallel to the axis of the needle. XIX. Repeat experiment XIV. Then, during its continuance, place a pile of three sovereigns on the compass-box, in front of the northward pole of the needle, and about an inch from it. _Result_—Direction of original rotatory motion reversed. Then follow experiments with results exactly parallel to the preceding, having the greatest physiological interest. XX. Hold the odometer over the tip of the forefinger of your disengaged hand. _Result_—Rotatory motion in the direction of the hands of a watch. XXI. Hold the odometer over the thumb of your disengaged hand. _Result_—Rotatory motion against that of the hands of a watch. XXII. Hold up the forefinger and thumb of the disengaged hand, their points being at two and a half inches apart. Hold the odometer in the centre of a line which would join the points of the finger and thumb. _Result_—Oscillations transverse to the line indicated.