Oh! weary heart, faint not! The Master knows thy need: One word of sincere prayer— He giveth loving heed. Oh! weary heart, yield not! If trials press thee sore: An arm of might is thine, The Lord saith, o’er and o’er. Oh! weary heart, believe! A faith that brings thee peace Is nobler far than doubt, With hope’s dark, dread surcease. Oh! weary heart, rejoice! Love never wrought in vain; Thou too shalt soon abide Where suns nor wax nor wane. * * * * * Oh! heart, thy weariness Long, long e’er this has fled; Thou liv’st the larger life Though numbered with the dead. ADVANTAGE OF WARM CLOTHING. There are men, called chemists, who know a great deal concerning the nature of different kinds of substances, and who, in consequence of this knowledge, are able to bring about very surprising changes and effects. These men have places, termed laboratories, or labor shops, in which they work, and which are divided into distinct chambers, besides being furnished with all sorts of instruments and vessels. Sometimes liquids are put into these chambers and vessels, and there turned into solids. Sometimes both liquids and solids are converted into invisible air. Sometimes beautiful crystals, white and blue, green and red, are brought out of transparent and colorless fluids. Sometimes a few grains of dusty looking powder are made to vanish into smoke with an explosion that shakes the ground for yards; and sometimes waste rubbish is transformed into delicious scents, resembling those which are produced from the violet and the rose. Even dull, black charcoal has been changed into the sparkling and precious diamond. It would require a very large book merely to number the wonderful feats these men of science are able to perform. Chemists, indeed, in the present day can do much more by their knowledge and skill, than magicians pretended they could accomplish in the olden time. Chemists make use of many very powerful agents in their laboratories, to aid them in carrying out their objects and plans. Among these agents there are two that stand before all the rest both in strength and in general usefulness. These prime assistants of the chemists are fire and water. The water is employed to dissolve substances whose little particles it is desired to bring closely together. When two different liquids thus formed are mixed, all the particles in the two come together and act upon one another. Fire is used to soften substances, and loosen the hold of their little particles upon each other, so that they may afterwards be readily mixed together. Water _dissolves_ bodies; that is, makes them liquid by uniting them with itself. Fire _melts_ bodies; that is, makes them liquid without the aid of water.