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Chang Chih-tung

(Encyclopedia)Chang Chih-tung jängˈ jûrˈ-do͝ongˈ [key], 1837–1909, Chinese Ch'ing dynasty statesman and educational reformer. He occupied the high post of governor-general for over two decades, first of Gua...

treaty port

(Encyclopedia)treaty port, port opened to foreign trade by a treaty. The term is usually confined to ports in those countries that formerly strongly objected to foreign trade or attempted altogether to exclude it. ...

Gaucher's disease

(Encyclopedia)Gaucher's disease gōshāzˈ [key], rare genetic disease involving a deficiency of an enzyme, glucocerebrosidase, which normally breaks down certain body glycolipids (i.e., lipids (fats) that have a s...

Henry, Joseph

(Encyclopedia)Henry, Joseph, 1797–1878, American physicist, b. Albany, N.Y., educated at Albany Academy. He taught (1826–32) mathematics and natural philosophy at Albany Academy and was professor of natural phi...

Ptolemy

(Encyclopedia)Ptolemy (Claudius Ptolemaeus), fl. 2d cent. a.d., celebrated Greco-Egyptian mathematician, astronomer, and geographer. He made his observations in Alexandria and was the last great astronomer of ancie...

parochial school

(Encyclopedia)parochial school pərōˈkēəl [key], school supported by a religious body. In the United States such schools are maintained by a number of religious groups, including Lutherans, Seventh-day Adventis...

Jewish liturgical music

(Encyclopedia)Jewish liturgical music, the music used in the religious services of the Jews. The Bible and the Talmud record that spontaneous music making was common among the ancient Jews on all important occasion...

periodic law

(Encyclopedia)periodic law, statement of a periodic recurrence of chemical and physical properties of the elements when the elements are arranged in order of increasing atomic number. Such an arrangement in the for...

school

(Encyclopedia)school, term commonly referring to institutions of pre-college formal education. It also properly includes colleges, universities, and many types of special training establishments (see adult educatio...

television

(Encyclopedia)CE5 Video transmission and reception of color and black-and-white television: The camera lens focuses collected light rays into mirrors, which separate the image into its three primary color compon...