An elementary introduction to different kinds of birds and someof their more interesting behavior.

Briefly describes the clothing cowboys wear; their duties on theranch, range, and roundup; and their recreation at rodeos.

Briefly introduces some distinctive characteristics, habits, similarities, and differences of a number of different insects.

Explains the changing of seasons and describes how plants and animals adapt to and prepare for these changes.

Describes briefly all aspects of baseball including the object of the game, the field, the equipment, positions, plays, teams, leagues, famous players, and games.

Describes the game of football as it is played by high school, college, and professional teams and lists the teams and some famous players of the National Football League.

Briefly describes dwellings adapted to distinct climatic and physical conditions such as the igloo, sampan, wigwam, and the apartment house.

Explains the development of our system of numbers, place value,and why numbers are used.

Introduces the parts of a tree and their functions, as well as the kinds of trees and their place in the environment.

Briefly discusses the physical characteristics and habits of owls, vultures, hawks, and eagles.