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Pneumatic may offer of making them highly useful. A gentleman's of more air through the side-holes. They are therefore Pneumatic Engines. house in the country may thus be supplied with water by a reclined a little backward, as represented in the figure. Engines.
machine that will cost little, and hardly go out of repair. It may be shown that their best form would be that of a
The last pneumatical engine which we shall speak of hyperbolic spiral abc; but the straight form approaches
round those parts of the drum where it cannot escape.
or drum, whose circular sides have a large opening BDE twice as much air if an opening were made all round Fig. 202. (fig. 102.) round the centre, to admit the air. By one side. This could be gradually contracted (where
turning the wings rapidly round, the air is hurried required for winnowing) by a surrounding cone, and
cessary, in order to prevent the air from arriving at the
P 0 C Pneum PNEUMATOSIS. See MEDICINE, N° 336. nople, where he prosecuted his studies of the eastern Pococke. tosis PNEUMONIA. See MEDICINE, No 183. tongues, and procured many valuable manuscripts. Af
1640; and taking Paris in his way, visited Gabriel Sio-
Arabic lectures ; but several governors of houses, &c. POA, MEADOW-GRASS; a genus of plants belonging presenting a petition in his favour, be was suffered to to the pentandria class, and in the natural method ranka enjoy both these places. He had some years before · ing under the fourth order, Gramina. See BOTANY published his Specimen Historia Arabum ; and now apand AGRICULTURE Index.
peared bis Porta Mosis: and soon after the English Po- . POCHETTI. See BARBATELLI.
lyglot edition of the Bible, to which he had largely POCOCKE, DR EDWARD, a learned oriental scho- contributed, and also Eutychius's Annals, with a Latin lar, was the eldst son of the Rev. Edward Pococke; version. At the Restoration, he was restored to the and was born at Oxford in 1604, where he was also canonry of Christ-church, and also received the degree educated. In 1628 he was admitted probationer-fellow of doctor of divinity. He then published his Arabic of his college, and about the same time bad prepared an version of Grotius's Treatise of the Truth of the Chrisedition of the Second Epistle of St Peter, the Second tian Religion; and an Arabic poem entitled Laimato l' and Third of St John, and that of St Jude, in Syriac Ajam, with a Latin translation and notes. Soon after and Greek, with a Latin Translation and Notes. In he published Gregory Abul Pharajius's Historia Dynas1629 he was ordained priest, and appointed chaplain to tiarum. In 1674 he published an Arabic version of the the English merchants at Aleppo, where he continued chief parts of the Liturgy of the church of England; five or six years; in which time he distinguished himself and a few years after his Commentary on the Prophecies by his fortitude and zeal while the plague raged there... of Micah, Malachi, Hosea, and Joel. This great man At length returning to England, he was in 1636 ap- died in 1691, after having been for many years conpointed reader of the Arabic lectures founded by Arch- fessedly the first person in Europe for eastern learning, bishop Laud. Three years after he went to Constantia and was no less worthy of admiration for his uncommon