Pyrrole

Any of a class of organic compounds of the heterocyclic series characterized by a ring structure composed of four carbon atoms and one nitrogen atom. The simplest member of the pyrrole family is pyrrole itself, a compound with molecular formula C4H5N. The pyrrole ring system is present in the amino acids proline and hydroxyproline; and in coloured natural products,

Death Rite, Rites and customs among secular materialists

It is significant, however, that, even where secularist principles are consciously professed, the dead are rarely disposed of without some semblance of ceremony. A deeply rooted feeling prompts most people to treat a dead human body with a respect that is not felt for a dead animal. It is significant that Communists make pilgrimages to the graves of Lenin and Marx;

Yin Mountains

Wade-Giles and Pinyin  romanization Yin Shan,   range in the Inner Mongolian autonomous ch'ü (region), China, comprising the Ta-ch'ing, Wu-la, Hara-narin, Sheyten, and Lang mountains. The Yin Mountains mostly rise to heights of about 6,500 feet (2,000 m). The highest peaks in the southwestern Ta-ch'ing Mountains reach 7,175 feet (2,187 m). The subranges run roughly east to west along the northern bend of the Huang Ho (Yellow River) to the north of the Ordos

Colonialism, Western, Colonial wars of the first half of the 18th century

From 1689 to 1763 the British and French fought four wars that were mainly European in origin but which determined the colonial situation, in some cases for two centuries. Spain entered all four, first in alliance with England and later in partnership with France, though it played a secondary role.

Berenson, Bernard

Reared in Boston, Berenson was educated at Harvard University, from which he was graduated in 1887. His first book, The Venetian Painters of the Renaissance (1894), displayed a concise writing style. He was also endowed with a discriminating eye, exceptional

Vigeland, Gustav

Vigeland's parents were farmers, and he was apprenticed to a wood-carver when he was 14 years old. His first work was shown in 1889, and, though early influenced by Auguste

Quantification

In logic, the attachment of signs of quantity to the predicate or subject of a proposition. The universal quantifier, symbolized by (-) or (-), where the blank is filled by a variable, is used to express that the formula following holds for all values of the particular variable quantified. The existential quantifier, symbolized ($-), expresses that the formula following holds