Kinds of magnets.--Exp. 5, To study the horseshoe magnet.--Poles; Equator.--Exp. 6, To ascertain the nature of substances attracted by a magnet.--Magnetic Bodies; Diamagnetic Bodies.--Practical Uses of Magnets.--Exp. 7, To study the action of magnetism through various substances.--Magnetic Transparency; Magnetic Screens.--Exp. 8, To find whether a magnet can give magnetism to a piece of steel.--Discussion; Bar Magnets.--Exp. 9, To make small magnets.--Exp. 10, To find whether a freely-swinging bar magnet tends to point in any particular direction.--North-seeking Poles; South-seeking Poles; Pointing Power.--The Magnetic Needle; The Compass.--Exp. 11, To study the action of magnets upon each other.--Exp. 12, To study the action of a magnet upon soft iron.--Laws of Attraction and Repulsion.--Exp. 13, To learn how to produce a desired pole at a given end of a piece of steel.--Rule for Poles.--Our Compass.--Review; Magnetic Problems.--Exp. 14, To find whether the poles of a magnet can be reversed.--Discussion; Reversal of Poles.--Exp. 15, To find whether we can make a magnet with two N poles.--Exp. 16, To study the bar magnet with two N poles.--Discussion; Consequent Poles.--Exp. 17, To study consequent poles. Exp. 18, To study the theory of magnetism.--Theory of Magnetism; Magnetic Saturation.--Exp. 19, To find whether soft iron will permanently retain magnetism.--Retentivity or Coercive Force; Residual Magnetism.--Exp. 20, To test the retentivity of soft steel.--Discussion.--Exp. 21, To test the retentivity of hard steel.--Exp. 22, To test the effect of heat upon a magnet.--Discussion.--Exp. 23, To test the effect of breaking a magnet.--Discussion. CHAPTER III. =Induced Magnetism= 20 Exp. 24, To find whether we can magnetize a piece of iron without touching it with a magnet.--Temporary Magnetism; Induced Magnetism.--Exp. 25, To find whether a piece of steel can be permanently magnetized by induction.--Exp. 26, To study the inductive action of a magnet upon a piece of soft iron.--Polarization; Pole Pieces.--Exps. 27-30, To study pole pieces. CHAPTER IV. =The Magnetic Field= 23