Describes the farmers of the Andes as a primitive people without the benefits of technology, showing the tireless Incas who till the mountain soil at altitudes of 10,000 to 15,000 feet. Discusses the role of the llama, alpaca, and vicuña in providing meat, milk, and hides for these farmers; illustrates how corn and wheat are irrigated by ditches dug by ancient Incas; and shows views of the primitive methods used in threshing and winnowing
