The following sections of this BookRags Literature Study Guide is offprint from Gale's For Students Series: Presenting Analysis, Context, and Criticism on Commonly Studied Works: Introduction, Author Biography, Plot Summary, Characters, Themes, Style, Historical Context, Critical Overview, Criticism and Critical Essays, Media Adaptations, Topics for Further Study, Compare & Contrast, What Do I Read Next?, For Further Study, and Sources.
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The following sections, if they exist, are offprint from Beacham's Encyclopedia of Popular Fiction: "Social Concerns", "Thematic Overview", "Techniques", "Literary Precedents", "Key Questions", "Related Titles", "Adaptations", "Related Web Sites". (c)1994-2005, by Walton Beacham.
The following sections, if they exist, are offprint from Beacham's Guide to Literature for Young Adults: "About the Author", "Overview", "Setting", "Literary Qualities", "Social Sensitivity", "Topics for Discussion", "Ideas for Reports and Papers". (c)1994-2005, by Walton Beacham.
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1742-1786
Swedish chemist who made many contributions to chemistry, including the discovery of oxygen. He probably prepared oxygen, which he called "fire-air," as early as 1772, two years before Joseph Priestley. Scheele, however, published little and his work was not as well known. Scheele's book Chemical Observations and Experiments on Air and Fire (1777) presented evidence that the atmosphere is composed of two gases, one of which prevented combustion and another that supported combustion. Other substances discovered by Scheele include tartaric acid, arsenic acid, lactic acid, citric acid, oxalic acid, tungstic acid, and hydrocyanic acid.