V A D 



V A D 



The air-pump can never produce a perfeft vacuum ; as 

 is evident from its ftrufturc, and the manner of its working : 

 in efFed, every exfuAion only takes away a part of the air : 

 fo that there will ftill be feme left after any finite number of 

 exfudlions. Add, that the air-pump has no longer any effeft 

 than while the fpring of the air remaining in the receiver is 

 able to lift up the valves : when the rarefaftion is come to 

 that degi-ee, you can come nearer to a vacuum. Sir Ifaac 

 Newton, obferving that a thermometer fufpended in vacuo, 

 and in that ftate removed to a warm or a cold room, receives 

 the heat or cold, and rifes, or falls, almoft as foon as an- 

 other in open air ; takes thence occafion to fufpeft, that the 

 heat of the warm room is conveyed through the vacuum, 

 by the vibrations of a much fubtiler medium than air, which 

 remained in the vacuum after the air was drawn out. Opt. 



P-323- 



Vacoum, TorrieeWian. See Torricellian. 



VADA, in Ancient Geography, a place which belonged 

 to the Batavi, \V. of Batavodurum. 



Vada Saiatia, Vai, a town of Italy, in Liguria. 



Vada Velaterra, a place of Italy, in Etruria. 



Vada, in Geography, a fea-port town of Etruria, at the 

 mouth of the river Cecina ; i8 miles S.W. of Volterra. 

 N. lat. 43° 17'. E. long. 10° 30'. 



VADACOURCHY, a town of Hindooftan, b Calicut ; 

 10 miles S.W. of Palicaudchery. 



VADAGARY, a town of Hindooftan, in Madura ; 

 2J miles W. of Coilpetta. 



VADAMADERRY, a town of Hindooftan, in the pro- 

 vince of Dindigul ; 15 miles N.E. of Dindigul. 



VADAMIA, a town of the Arabian Irak, on the 

 Euphrates ; 105 miles W.N.W. of Baffora. 



VADARI, in the Civil Law, denotes a perfon to pledge, 

 undertake, or give fecurity, in behalf of another, that he 

 fhall, on a certain day, appear in court, to profecute, or 

 anfwer. 



If he fails, his furety has an aftion vadimonti dejerti 

 againft him ; that is, an aftion for deferting his bail. See 

 Wager. 



Properly fpeaking, vadari reum, among the Romans, was 

 the aft of the plaintiff' himfelf, who here demanded furety, 

 or bail from the defendant, that he would appear before the 

 praetor on a certain day. 



VADDAL, in Geography, a town of Hindooftan, in 

 Soonda ; 27 miles S.E. of Goa. 



VADDER, Louis de, in Biography, an eminent land- 

 fcape painter, was born at Bruffels in 1560. It is not 

 known under whom he ftudied, where he refided, or how 

 long he lived ; but he has left works behind him which exhibit 

 him as a dihgent obferver of nature, with tafte and feehng 

 to feleft her moft fafcinating effefts, and ability to execute 

 what he attempted, fo as to afford the greateft pleafure to 

 all admirers of the art. 



It is not improbable that he refided fome time in Italy, 

 and had ftudied the piftures of Titian ; perhaps wrought in 

 the fame fcenery ; for his fineft works have a great degree 

 of refemblance to thofe of the Venetian, in the choice of 

 forms and colour however more than in the execution, 

 m which he more refembles Pynacher in freftinefs and 

 fulnefs. 



Tv.'O large piftures by Vadder found their way into this 

 country fome time ago, and fully juftify thefe remarks ; but 

 in general his works are fcarce, or moft probably have been 

 introduced under fiftitious names. In his native country 

 he is better known and juftly efteemed. He has left a few 

 fpirited etchings in the llyle of Lucas Van Uden. 



VADE', John Josefh, was bom at Ham, in Picardy, 



and is diilinguillied as the inventor of a kind of humorous 

 French poetry. In his youth he refided at Paris, and 

 led a diffipated life ; but in more advanced age he per- 

 ceived the defefts of his early education, and endeavoured 

 to fupply them by a perufal of the beft French authors. 

 As he was original in his mode of thinking, he adopted a 

 new kind of writing, to which he was led by his familiaritv 

 with vulgar life. This fpecies of writing was called the 

 " Poiflarde manner," and he was hence denominated the 

 " Teniers" of poetry. His produftions, which confifted 

 of tales and fongs, were amufing and popular ; and as he 

 pofTefled many amiable qualities, he was generally beloved 

 in the gay focieties which he frequented. But he was thus 

 led to purfue a courfe of debauchery', which terminated his 

 life in 1757, at the early age of 37 years. His works, con- 

 fifting of comic operas, parodies, fongs, Sec. have been col- 

 lefted in 4 vols. 8vo., to which has been added a volume of 

 pofthumous pieces of a fimilar nature, though of fuperior 

 merit, and indicating talents of a higher clafs, which he 

 mifht have cultivated to advantage. Moreri. Nouv. Dift. 

 Hilt. 



VADELECT. See Valet. 



VADE-MECUM, or a Veni-mecum, a Latin phrafe, 

 ufed in Englilh, to exprefs a thing that is very famihar ; 

 and which any one ufuaUy carries about with him : it is 

 chiefly appUed to fome favourite book. 



Some make Virgil, others Horace, their vade-mecum ; 

 others an Epiftetus, &c. 



This is what the Greeks call sy^ff'-J"', or manual. The 

 Arabs have a phrafe of equal import; w'z. Habib al feir, 

 comes itineris, companion of the journey. In Latin it is 

 beft exprelfed by comes ; as comes theologicus, comes ruf- 

 ticus, &c. 



VADENAGORCHY, in Geography, a town of Hin- 

 dooftan, in Coimbetore ; 15 miles W. of Damicotta. 



VADIANUS, Joachim, in Biography, was born in 

 1484, at St. Gall in Switzerland, where his father, Leonard 

 Von Watt, was a fenator. Having ftudied at Vienna, he 

 was chofen profeflbr of the belles lettres, and reftor of the 

 univerfity. In 1514 he was honoured at Lintz by the 

 emperor Maximilian with the poetical laurel. In his fub- 

 fequent travels, he applied to the ftudy of geography, and 

 in 15 1 8, having taken the degree of M.D. at Vienna, he re- 

 turned to St. Gall, and devoted himfelf to the praftice of 

 phyfic, to which he joined theology upon the principles «f 

 the reformers, whofe caufe he promoted as a fenator, and alfo 

 by his difcourfes and writings. Having been honoured 

 eight times with the office of conful, he died in 1551, and 

 bequeathed his library to his fellow-citizens. On the vari- 

 ous fubjefts of mathematics, geography, antiquities, medi- 

 cine, and theology, he pubhflied works, as well as feveral 

 Latin poems. His " Commentary on Pomponius Mela 

 de Situ Orbis," and his " Scholia on the fecond Book of 

 Pliny's Natural Hiftory," are the moft generally known of 

 his literary performances. Scaliger regarded Vadianus as 

 one of the moft learned men in Germany ; and on account 

 of his able conduft of public aff"airs, Thuanus prefents 

 him to notice, as an example, that men of letters and philo- 

 iophers are not, as fuch, difquahfied for bulinefs. Moreri. 



VADIATION. See Vadari. 



VADICASSES, in Ancient Geography, a people of 

 Gaul, who have been diftinguiftied by different denomina- 

 tions : the BodiocafTes of Pliny being the fame with the 

 Vadicaffes of Ptolemy, and both are fuppofed to compre- 

 hend the ancient inhabitants of Bayeux, anciently caiUed 

 Nxomagus. 



VADILCORA, or Vadi ml Ktra, in Geography, a 



town 



