AGRICULTURAL NATURE STUDY OUTLINES 
51 
ington, D.C., No. 287, “Poultry Management’’; No. 64, “Geese and 
DucksNo. 51, “Standard Varieties of Chickens”; No. 236, 
“Incubators”; No. 200, “Turkeys”; No. 225, “Poultry House Con¬ 
struction. ’ ’ 
Wild mammals. —Study California ground squirrel; chipmunk; 
gray squirrel. See descriptive matter on other pages. See also 
suggestions in outlines on mammals in the Sixth grade. 
Hogs. —General discussion of the swine interest of the community. 
How many ranchers keep hogs? Description of the different breeds. 
How many breeds are found in the community? Care of swine. 
Food. Diseases. Value for food. Importance as a farm animal. See 
Circular no. 151, “Feeding and Management of Hogs,” College of 
Agriculture, University of California* 
4. Physical Phenomena and the Inorganic World 
Heat. —Importance in agriculture. Review thermometer. Sources 
of heat. Methods of heating houses. Effects of heat upon solids, 
liquids, and gases. Work and heat. Principles of expansion and 
contraction. See Rowell’s Elementary General Science, Book I; also 
Holden’s Beal Things in Nature. 
Sound. —How caused? Sound waves. Difference between sound 
and music. The voice. How is sound carried? Velocity of sound. 
Compare with light. If there were no ear to hear would there be any 
sound ? 
Electricity. —Elementary discussion of how generated, use of bat¬ 
teries, etc. Relation to telegraph, telephone, railway, etc. Possibilities 
of electricity on the farm, lighting, cooking, etc. The dynamo and the 
gasoline engine. 
