What did Roger Bacon do?

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Bacon was learned in Hebrew and in Greek and stressed the value of knowing the original languages in the study of Aristotle and of the Bible. He may also have known Arabic; his own philosophy drew upon Arab Aristotelianism as well as upon St. Augustine. He had an interest far in advance of his times in natural science, in controlled experiments, and in the accurate observation of phenomena. "It is the intention of philosophy," he said, "to work out the natures and properties of things." He declared that mathematics was the gateway to science, and experience, or verification, the only basis of certainty. This belief in experience as a guide to the outer world was, however, not divorced from theology; wisdom and faith were to him one. His writings were numerous. Three of his most important works were written for Pope Clement IV in one year (1267-68)—the Opus majus (tr. 1928), the Opus minor, and the Opus tertium. He was deeply interested in alchemy, an interest that may account for his being credited by his contemporaries with great learning in magical practices. He was long credited with the invention of gunpowder (because of a formula for gunpowder that appeared in a work attributed to him). A manuscript in cipher, discovered in the 20th cent. and attributed to him, would make Bacon the first man to have observed spiral nebulae through a telescope and to have examined cells through a microscope; but considerable doubt has been cast on the original date and the authenticity of the manuscript. Earlier editions of his major works were supplemented by an edition of his hitherto unedited works in various fascicles by Robert Steele and others (1909-35).