They require exercise.
Their food must have in it the materials that are needed to make the substance of the egg.
Breakfast: Wheat or corn scattered among straw—the scratching affords exercise.
Dinner: Meat scraps, slaughter-house refuse, vegetables, sour milk, and rolled oats.
Supper: As at breakfast.
PHYSICAL SCIENCE PHASE OF NATURE STUDY
The teacher is advised to read carefully the instructions and General Method of Experimental Science, Chapter I, before beginning the lessons in Physical Science.
SOLIDS, LIQUIDS, AND GASES
Arrange a collection of objects of various shapes, sizes, colours, and weights, as cork, glass, lead, iron, copper, stone, coal, chalk. Show that these are alike in one respect, namely, that they have a shape not easily changed, that is, they are solids. Compare these solids with such substances as water, alcohol, oil, molasses, mercury, milk, tar, honey, glycerine, gasolene. These latter will pour, and depend for their shape on the containing vessel. They are liquids. Compare air with solids and liquids. Such a material as air is called a gas. Other examples of illuminating gas, and dentists' "gas"; others will be studied in future lessons. Pupils may think all gases are invisible. To show that some are not, put a few pieces of copper in a test-tube or tumbler and add a little nitric acid. Watch the brown gas fall through the air; note how it spreads in all directions. Some gases fall because they are heavier than air; others rise because lighter. All gases spread out as soon as liberated and try to fill all the available space. Spill a little ammonia and note how soon the odour of the gas is smelled in all parts of the room.