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Dig In! Hands-on Soil Investigations
$12.90
Book
Give students the dirt on soil with a practical book that brings new meaning to the term "hands-on." Using these 12 activities and two original stories as guides, kids will soon be up to their elbows in the study of soil formation, habitats and land use, animals that depend on soil, plants that grow in soil, soil science, and soil conservation. Each teacher-tested lesson plan offers helpful background, assessment methods, and suggestions for further exploration.
This book also contains SciLinks--Internet links, housed on an NSTA web site, that we promise to keep up-to-date and relevant to your teaching for as long as the book stays in print!
An Essay on the Principles of Population
$9.22
Book
The Rev. Thomas Robert Malthus (February, 1766 – December 23, 1834), who is usually known as Thomas Malthus, although he preferred to be known as "Robert Malthus," was an English demographer and political economist best known for his pessimistic but highly influential views. Although it is popularly assumed that it was these pessimistic views that gave economics the nickname Dismal Science, the phrase was actually coined by the historian Thomas Carlyle in reference to an anti-slavery essay written by John Stuart Mill. Malthus was born to a prosperous family. His father was a personal friend of the philosopher and sceptic David Hume and an acquaintance of Jean-Jacques Rousseau. The young Malthus was educated at home until his admission to Jesus College, Cambridge in 1784. There he studied many subjects and took prizes in English declamation, Latin and Greek. His principal subject was mathematics. He earned a masters degree in 1791 and was elected a fellow of Jesus College two years later. In 1797, he was ordained and became an Anglican country parson. Malthus's views were largely developed in reaction to the optimistic views of his father and his associates, notably Rousseau and William Godwin. In An Essay on the Principle of Population, published in 1798, Malthus predicted population would outrun food supply, leading to a decrease
in food per person. This prediction was based on the idea that population if unchecked increases at a geometric rate (i.e. 2, 4, 8, 16, 32, 64, 128, etc.) whereas the food supply grows at an arithmetic rate (i.e. 1, 2, 3, 4, 5, 6, 7, etc.) (See Malthusian catastrophe for more information.) Only misery, moral restraint and vice (which for Malthus included contraception) could check excessive population growth. Malthus favoured "moral restraint" (including late marriage and sexual abstinence) as a check on population growth. However, it is worth noting that Malthus proposed this only for the working and poor classes. Thus, the lower social classes took a great deal of responsibility for societal ills, according to his theory. Essentially what this resulted in was the promotion of legislation which degenerated the conditions of the poor in England. The influence of Malthus's theory of population was very great. Previously, high fertility had been considered an economic plus since it increased the number of workers available to the economy. Malthus, however, looked at fertility from a new perspective and convinced most economists that even though high fertility might increase the gross output it tended to reduce output per capita.
