Mrs. Hopkins has been a matron at the Perkins Institution for twenty years, and during the time that Miss Sullivan was a pupil there she was like a mother to her.
Every Frenchman therefore is a member of the army practically or potentially from the age of twenty to the age of forty-five.
Meanwhile Shamyl had roused the Lesghian tribes farther east and begun his twenty years' struggle for freedom, a struggle which called forth the sympathy and admiration of nearly the whole of Europe.
The megaspore becomes filled with tissue (prothallus), and from some of the superficial cells archegonia are produced, usually three to five in number, but in rare cases ten to twenty or even sixty may be present.
Smith had omitted the paragraph in question (an omission which had escaped notice for twenty years) on the ground that it was unnecessary and misplaced; but Magee suspected him of having been influenced by deeper reasons.
Hoffman founded at New York the Knickerbocker (1833-1860), which soon passed under the control of Timothy Flint and became extremely successful, most of the leading native writers of the next twenty years having been contributors.
During his four years at the university his mother supplied him fortnightly with provisions from the farm; sometimes she walked the whole twenty miles from Kirkhill and handed the coach fee to her son.
Such nymphaea existed at Corinth, Antioch and Constantinople; the remains of some twenty have been found at Rome and of many in Africa.
Each of the twenty triangular faces subtend at the centre the same angle as is subtended by four whole and six half faces of the Platonic icosahedron; in other words, the solid is determined by the twenty planes which can be drawn through the vertices of the three faces contiguous to any face of a Platonic icosahedron.
Verhoeff has lately (1904) put forward the view that there are really six segments in the hexapodan thorax and twenty in the abdomen - the cerci belonging to the seventeenth abdominal segment thus showing a close agreement with the centipede Scolopendra.