U N G 



feconds. See the treatife before cited, prop. xv. p. 215. 

 a;id the Table, p. 244. plate 20. 



From this ingenious theory the learned author has de- 

 monftrated feveral errors in what monfieur Sauveur has 

 dehvered concerning thefe undulations or beats. See Har- 

 monics, Scholium 2. p. 115. 



In the fame treatife we find fome curious obfervations 

 relating to the analogy of audible and vifiblc undulations. 

 See p. 128. 273. 



Undulation is alfo ufed in Surgery, for a motion en- 

 fuing in the matter contained in an abfcefs, upon fqueezing 

 it. A tumour is faid to be in a condition for opening, 

 when one perceives the undulation. 



UNDULATORY Motion is applied to a motion in 

 the air, by which its parts are agitated after the like manner 

 as waves in the fea ; as is fuppofed to be the cafe when the 

 rtring of a mufical inftrument is ftruck. 



This undulatory motion of the air is fuppofed the matter 

 or ca\iie oi found ; which fee. 



Inftead of the undulatory, fome authors choofe to call this 

 a vibratory motion. 



UNDULATUM Folium, in Botany. See Leaf. 



UNDULLEE, in Geography, a town of Bengal ; 5 

 miles S. of Doefa. 



UNDY, in Heraldry. See Waved. 



UNEDO, in Botany, the name of a fruit, fo called, ac- 

 cording to Pliny, book 25. chap. 24, becaufe one only was 

 to be eaten. He gives /Irbutus as a fynonym. The mean- 

 ing of the above name feems to be, that the fruit in queftion 

 might, by its beauty, tempt any perfon to eat it once, but 

 that its infipidity would prevent any further inclination to 

 tafte it. We have, neverthelefs, found this fruit gratefully 

 refrefhing and wholefome in our fatiguing botanical excur- 

 fions in the fouth of France, and have eaten it plentifully. 

 (See Arbutus Unedo.) This tree, figured in Engl. Bot. 

 t. 2377, is found about the lake of Killarney, in Ireland, in 

 a naturahzed, if not a wild, ftate. The Comaron of the 

 Greeks, mentioned by Pliny, is not this, but /Irbutus An- 

 drachne ; fee Prodr. Fl. Gnc. v. I. 274. 



UNELLI, or Venelli, in Ancient Geography, a people 

 mentioned by Caefar among other inhabitants of Armorica, 

 and not belonging to Brittany. Ptolemy defcribcd their 

 capital under the name of Crociatonum, the pofition of which 

 is that of Valognes. In the Notitia of the provinces of 

 Gaul, Civitas Conftantia, from which the appellation of Co- 

 tentin is derived, was the capital of the canton occupied 

 by the Unelli. 



UNEQUAL, in Botany, applied to a leaf, means that 

 the two halves, feparated by the mid-rib, ai'e of evidently 

 different dimenfions, and efpecially that their bafes are not 

 parallel. Inftances occur in the Elm, (fee Ulmus,) as well 

 as in the fine exotic genera of Begonia and Eucalyptus. The 

 fiirface of a leaf or Jlem is termed unequal, when it is rugged, 

 not even or fmooth, without any reference to the pubefcence. 

 An unequal corolla has fome fegments, or petals, alternately 

 fmaller than the others, fo as not to interfere with the regu- 

 larity of its figure. This may occur in fome fpecies of a 

 genus only, nor does it ncccfTarily mark a generic difference. 

 — Stamens are unequal in the clafles Didynamia and Tetrady- 

 namia, with refpedl to their proportion only. 



Unequal Courfes. See Masonrv. 



Unequal Hours. See Houn. 



UNEVEN Number. See Number. 



UNG, in Geography, a river of Hungary, which rifes in 

 the Crapack mountanis, and runs into the Latoreza, 7 



miles N. of Zemplin Alfo, one of two fmall ftreams 



which form the river Laubach, in Carniola. 



Vol. XXXVII. 



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UNGELD, compounded of the negative m, and gildan, 

 to pay, in our Ancient Cujloms, a perfon out of the proteAion 

 of the law ; fo that if he were murdered, no geld, or fine, 

 was to be paid in the way of compenfation by him that 

 killed him. See Geld, and ^Estimatio capitis. 



Si Frtthman, i. e. homo pads, fugiat et repugnet, et fe nolit 

 indicare ; ft occidalur, jaceat ungeld, i. e. no pecuniary com- 

 penfation (hall be made for his death. Skinner. 



Ungilda akere, mentioned in Brompton, has much the 

 fame iignification ; vi%. where any man was killed, attempt- 

 ing any felony, he was to he in the field unburied, and no 

 pecuniary compenfation was to be made for his death. 



UNGHA, in Geography, a town and caftle on the eail 

 coaft of Tunis, furrounded by moraffes, but without a har- 

 bour, or road ; 76 miles S. of Cairoan. 



UNGVAR, a town and fort of Hungary, on the Ung. 

 This town was feized by the malecontents ; but, in 1685, 

 recovered by the Imperialifts, with count Tekeli's treafure 

 and jewels ; 22 miles N. of Munckacz. 



UNGUENT, Unguentum, Ointment, in Surgery, a to- 

 pical remedy, or compofition, chiefly ufed in the drefllng of 

 wounds and ulcers. 



Unguents, liniments, and cerates, are external forms, ap- 

 plied on divers parts of the body, both to cure, and to 

 eafe and relieve them. They only differ from each other 

 in their confiftence ; with regard to which, unguents hold 

 the medium ; being ftifFer than liniments, but fofter than 

 cerates. 



Oils are ordinarily the bafes of all three ; to which are 

 added wax, axungia, and feveral parts of plants, animals, 

 and minerals ; both on account of the virtues they furnifti, 

 and to give a confiftence to the oils, and to Iteep them longer 

 on the part, that they may have more time to aft. 



Many extravagant encomiums have been beftowed on the 

 efScacy of different preparations of this kind in the cure of 

 wounds, fores, &c. and yet it is unquellionable, tliat the 

 moft proper apphcation to a green wound is dry lint. But 

 though ointments do not heal wounds and fores, they fcrve, 

 however, to defend them from the external air, and to retain 

 fuch fubftances as may be necffiary for dr^ang, deterging, 

 deftroying proud flefh, and fuch purpofes. 



We (hall here enumerate and defcribe the principal cerates. 



The common cerate of the Lond. Pharm. is formed by 

 adding four fluid-ounces of olive oil to four ounces of yellow 

 wax, and mixing them. 



For the calamine cerate of the Lond. Ph. fee CEBATin# 

 epuloticum. 



The cerate of impure carbonate of zinc, formerly cerate of 

 calamine ftone, Edinb. Ph., is compounded of five parts of 

 fimple cerate, and one part of prepared impure carbonate of 

 zinc. Thefe cerates, long known \n praftice under the name 

 of " Turner's cerate," are ufeful dreflings in excoriations 

 and ulcers ; and as they are in a certain degree deficcative, 

 they are applied to burns after the inflammation is abated, 

 and to the eye-hds in ophthalmia tarfi. 



Tot cerate of blijlering flies, ceratum Lytti, or ceratum 

 cantharidis, fee Ceratum. This cerate is intended to pro- 

 mote a purulent difcharge from a bliftcred furface, and it 

 generally anfwers this purpofe without much irritation. But 

 m fome habits it occafions ftrangury, great pain ot tlic part, 

 fwtUings of the lymphatics, and fuch a degree of general 

 irritation, as to produce ocdematous fwellings, and crj'fi- 

 pelas of the neighbouring parts. It is obfcrvcd, that cerates 

 or ointments for keeping open iffucs are bcft fprcad on lint ; 

 and that the dreffiogs fliould in all cafes be renewed once in 

 twenty-four hours. 



Cerate of fuperaeetate of lead of the Lond Ph. is prepared 

 3 A of 



