Explains the difference between the two principal methods of secret writing: codes (which use symbols for whole words) and ciphers (which use symbols for different letters of the alphabet); also gives examples throughout history of each.

A history of Ancient China which explains the origins of her languages, cultures, dynasties, empires, and religions.

Traces the history of the smallest of the Thirteen Colonies fromits founding in 1636 to statehood in 1790.

Traces the history of guilds from their beginnings in medieval Europe to their decline in the sixteenth century.

Discusses the ecological requirements of a terrarium and gives directions for building different kinds of plant and animal terrariums.