Euclid's Elements Euclid's Elements The Elements ( "Stoicheia") is a mathematical treatise consisting of 13 books attributed to the ancient Greek mathematician Euclid in Alexandria, Ptolemaic Egypt c. 300 BC. It is a collection of definitions, postulates, propositions (theorems and constructions), and mathematical proofs of the propositions. The books cover plane and solid Euclidean geometry, elementary number theory, and incommensurable lines. "Elements" is the oldest extant large-scale deductive treatment of mathematics. It has proven instrumental in the development of logic and modern science, and its logical rigor was not surpassed until the 19th century. Euclid's "Elements" has been referred to as the
In the Reign of Terror: The Adventures of a Westminster Boy In the Reign of Terror: The Adventures of a Westminster Boy In the Reign of Terror: The Adventures of a Westminster Boy is a novel by G. A. Henty published in 1888. The novel follows the adventures of Harry Sandwith, an English boy sent to live with the Marquis de St. Caux during the height of the French Revolution. Harry Sandwith, a sixteen-year-old English boy, is sent to live in France with the Marquis de St. Caux, a friend of a French nobleman Harry's father once served. The marquis is impressed with the English system of schooling and believes that