T R A 



each 'fide, being the lefler or concomitant veins. Five in tlie 

 fame manner fometimes lie in this order, tlie grand lode in 

 the middle and two on each fide ; but the more common me- 

 thod is three, a large one, and two fmaller. 



Every lode has a peculiai' coloured earth or grewt about 

 it, which is found alio with the flioad, and this always in a 

 greater quantity the nearer the fhoad lies to the lode, and 

 becomes leffened by degrees to the diftance of about a 

 1 quai-ter of a mile, farther than which that peculiar grewt is 

 t never found in any quantity with the Ihoad ; fo that this 

 is a proof that the lode or vein is near, «'hen it is found in 

 any quantity. 



A valley may chance -to lie at the foot of three feveral 

 hills, in fuch a manner as to contain three feveral grewts, or 

 that earth which was moved with the Ihoad in the concuffion 

 of the ftrata at the deluge, with as many different fhoads or 

 trains of flioad-ftones in the midft of each : in this cafe it will 

 be very neceffary to know the call oi the country, and of 

 each hill in i-cfpe£l to its grewt, for the furer training of 

 them one after another as they lie ia order : according to the 

 foregoing rules of eflay-hatching, the uppermoll in this cafe 

 always direfts which hill to begin with firil. 



It fometimes happens, that after having trained the fhoad 

 found in a valley up to the upper parts of a hill, there is only 

 a fquat, or bonny, found inftead of a right vein of ore ; for 

 thefe detached parcels of ore have their flioads as well as the 

 right veins. Thefe are ufually about two or three fathoms 

 long, and a f.ithom broad, few of them are larger, moft lefs, 

 and they never communicate with any other lode or vein, nor 

 ever fend forth any of their own. The extremities of thefe 

 beds of ore terminate without fending out any firings, not 

 lying within walls as the lodes ; but though they ai-e in the 

 fhelf or fad ground, not moved by the flood, their furface 

 is equal every where with that of the imaginary flielfy one, 

 and they go down five or fix fathoms deep, and there termi- 

 nate at once. The ore contained in thefe is rich, and they 

 are always wrought out to the confiderable advantage of the 

 owners. 



Thefe are the general rules of tracing mines, and though 

 fomewhat tedious and expenfive, they are certain, and never 

 fubjeft to the error and difappointment the other fhorter ways, 

 as they are called, are liable to. Thefe Ihort ways are by the 

 •virgula divinatoria, or the hazel-wand, whofe bending in cer- 

 tain places without any external vifible force, is to point out 

 where the place the vein of ore lies : the waters thought to 

 iffue from the particular lodes, are alfo ufed by fome as a fhort 

 means of finding the veins ; other of thefe ways are alfo by 

 mineral flreams and effluvia, by the barrennefs of the foil, 

 and the pitching of nofturnal lights on the fuppofed ori- 

 fices- of mines. But thefe methods are too extravagant or 

 too uncertain to be ufed in cafes of fo mucl) confequence. 



Another way of difcovering lodes, is by working drifts 

 acrofs the country, as it is called, that is, from north and 

 fouth, and vice •verfn. 



When the mine is found by the more certain rules of 

 tracing, the digging of it is a matter of lefs difficulty. Phil. 

 Tranf. No. 69. See Mineralogy, and Pryce's Mineral. 

 Cornub. book iii. cap. I. 



Training of Cattle, in y^gria/lture, the praftice of taming 

 and breaking in oxen and other neat cattle for the purpofe 

 of team-labour. It is performed in many different ways in 

 different diftridls and places ; but principally by firfl gradu- 

 ally accufloming them to be led by means of a halter or rope, 

 and then ufing them to travel in other forts of teams after the 

 yoke or harnefs has been put on and rendered familiar to 

 them ; when afterwards they may be wrought in the plough- 

 teams with the old labouring oxen, being placed between 



T R A 



them both before and behind, and with fuch as are not too 

 free workers. See Tkam, Yoke, and Yoking. 



TRAISENDORF, in Geography, a town of Ger- 

 many, in the principality of Culmbacli ; 5 miles N.I^. of 

 Bayreuth. 



TRAIT, Fr. Traaus, is the name of an ancient mufical 

 charafter, called likewife in old Latin treatifes, plka ; 

 which fee. 



TuAiT, or Ted'ta, in Geography, a town of Romania, on 

 the Mariza ; 12 miles S.W. of Fihppopoli. 

 TRAITOR. SeeTRAYTOR. 



Traitor'j- Cow, in Geography, a harbour on the weft 

 coaft of the ifland of Revilla Gigedo, in the North Pacific 

 ocean ; fo caUed by captain Vancouver, from the circum- 

 ftance of being attacked, and t\yo of his men wounded, 

 by the natives of this place. N. lat. 55^ 40'. E. long. 

 228^ 31'. 



Traitor'j- Head, the north-ead point of Erromango, 

 one of the New Hebrides, fo called by captain Cook in 1 774, 

 from the treacherous condudl of its inhabitants. S. lat. 

 18^43'. E. long. i6g° 28'. 



Traitor'j- JJlands, a duller of fmall iflands, in a bay of 

 the Pacific ocean, on the coafl of New Guinea. S. lat. 

 I*' 12'. E. long. 137°. 



Traitor'j IJland, an ifland in the Pacific ocean, dif- 

 covered by Le Maire and Schouten in 161 6, and fo called 

 from an attempt made by the natives to feize the veflTel. M. 

 Peroufe difcovered this ifland to be divided into two parts, 

 by a channel about 150 toifes -wide. It belongs to the 

 Friendly iflands, and is called by the natives Neoota-boota- 

 boo ; 16 miles from mount Cocos. N. lat. 15° 55'. W. 

 long. 173^48'. 



Traitor'j IJland. See Keppel'j IJland. 

 TRAITTE. See Foreign Trakte. 

 TRALEE, in Geography, a pofl-town in the county of 

 Kerry, Ireland, pleafantly fituated at the bottom of Tralee 

 bay, on the banks of the river Lee. It is the fliire and affizes 

 town of the county ; was incorporated in i6l2 by James I. ; 

 and fends one member to the imperial parliament. There 

 were formerly four fl:rong caftles ereded in this town, of 

 which only one remains, which was the chief refidence of the 

 Defmond family, in which they exercifed their jurifdiftion 

 during the continuance of the Palatinate. Tralee bay is flial- 

 low and unfafe, and therefore not much frequented. Near 

 the town is a chalybeate fpring, which is drunk medicinally 

 with fuccefs. Tralee is 144^ miles S.W. by W. from 

 Dublin, and 48 S.W. from Limerick. 



TRAIjLEBORG, a fea-port town of Sweden, in the 

 province of Skone, near the Baltic ; 19 miles S. of Lund. 

 N. lat. 55° 20'. E. long. I z° 54'. 



TRALLES, Balthasar-Lewis, in Biography, an 

 eminent phyfician, was born at Breflau in 1708, and 

 having ftudied medicine at Hall under Frederic Hoffman, 

 fettled in his native city, where he gained great reputation. 

 His works were numerous and valuable, and caufed him to 

 be admitted into the Imperial Academy at Vienna, and the 

 Royal Society of Berlin. But his moll celebrated work was 

 that on opium, entitled " Ufus Opii falubris et noxius in 

 Morborum Medela, fohdis et certis principiis fuperllruc- 

 tus," 1757-1762, 2 vols. 4to. He alfo pubhflied a treatife 

 againfl the materialifm of La Mettrie. He declined, in 

 1767, accepting the ofter of firft phyfician at Warfaw to 

 Staniflaus, king of Poland, partly on account of his advanced 

 age, and principally from ilia attachment to the reformed 

 religion. HaUer. Eloy. 



TRALLIA, called alfo Troalidda, in Ancient Geo- 

 graphy, a country of lUyria. 



TRALLI- 



