T R I 



Such is X + J' + K, or a -^ i — c. vSee Involutiov. 



TRIO, in Italian Terzetto, a vocal compofition in three 

 principal parts, cxclufive of the accompaniments. In 

 chamber duets and trios, fuch as thofe of StefFani and 

 Clari, in which each part repeats the fame words, the great 

 merit was pure harmony, and ingenious fubjetls of fugue 

 and imitation. But in the dr.-imatic duets and trios of 

 modern times, the feveral parts have different words and 

 different paffions to exprefs. In an opera trio, the feveral 

 charafters are dialogued, and feldom fmg together ; and in 

 each folo part a beautiful, interefling, and charafteriftic 

 melody is required. . But in moments of pafiion, where 

 the three parts are united, and exprefling with energy and 

 paffion their feveral complaints and accufations, it is that, 

 united with the orcheftra, an intereft will be produced at 

 once by combinations of poetry, harmony, and ftage effefts. 



There is nothing more difficult, perhaps, for the poet to 

 write, or the compofer to fet, than a dramatic trio. 



TRIOCTILE, in AJlrology, an afpeft, or fituation, of 

 two planets with regard to the earth, when they are three 

 odlants, or eight parts of a circle, /. e. 135 degrees, diftant 

 from each other. 



This afpeft, which fome call the fefqu'iquadrans , is one 

 of the new afpefts fuperadded to the old ones by Kepler. 



TRIODIA, in Botany, from TpEi.-, t^ios, three, and oJou.% 

 a tooth, alluding to the three, nearly equal, teeth, of the 

 outer valve of the corolla. — Brown Prodr. Nov. HoU. v. i. 

 182. Kunth Nov. Gen. et Sp. v. i. 126. — Clafs and 

 order, Triandria Dlgynia. Nat. Ord. Gramma. 



EfT. Ch. Calyx many-flowered, of two nearly equal 

 valves. Outer valve of the corolla with three, nearly equal, 

 teeth ; the middle one ftraight. Neftary of two fcales. 



A genus of perennial, rather rigid graifes, with panicled 

 flowers, and the habit of a Poa or Fejluca. Mr. Brown 

 fufpetls Fejluca decumbens of Linnsus, which is Poa decum- 

 hens of Sm. Fl. Brit., Danthon'ta decumbens of Decandolle, 

 ought to be removed hither. Our learned friend alfo has 

 hinted to us, that the two South American fpecies of 

 Humboldt and Bonpland, here fubjoined to his own New 

 Holland ones, though they anfwer to the generic charafter, 

 are confiderably different in appearance from the reft. 



1. T. pungens. Br. n. I. — " Panicle rather clofe, ereft ; 

 with alternate, moftly fimple, branches. Spikelets lanceo- 

 late, of about fix flowers. Outer valve of the corolla 

 woolly at the edges and keel, in its lower half. Leaves 

 fpreading, involute, pungent ; fheaths of the lower ones 

 vifcid." — Found by Mr. Brown, in the tropical part of New 

 Holland. 



2. T. procera. Br. n. 2 " Panicle loofe ; its branches 



undivided, fpiked. Spikelets fomewhat flalked, of three 

 or four flowers. Calyx roughifli. Outer valve of ♦he 

 corolla very fmooth at the keel, and nearly fo at the edges. 

 Leaves involute, rather lax ; their fheath with a filky beard." 

 — From the fame country. 



3. T. parinfora. Br. n. 3 " Panicle loofe, elongated ; 



its branches undivided, fpiked. Spikelets linear, of about 

 fix flowers. Outer valve of the corolla naked at the keel ; 

 rather downy at the edges. Leaves involute, rather lax. 

 Stipula torn." — From the fame country. 



4. T . microjlachya. Br. n. 4.— "Panicle elongated, rather 

 clofe ; it; branches undivided, fpiked. Spikelets about 

 three-flowered. Glumes rough. Outer valve of the co- 

 rolla blunt, with three very fViort teeth ; its keel and edges 

 fmooth. Leaves involute ; their fheath bearded." — From 

 the fame country as the three foregoing. 



5. T. irritaiis. Br. n. 5. — " Panicle clofe. Spikelets 

 lanceolate, imbricated. Outer valve of the corolla villous 



Vol. XXXVI. 



T R I 



at the bafe. Leaves involute, fpreading, rigid, pungent."— 

 Native of the fouthern coaft of New Holland. 



6. T. ambigua. Br. n.6.-« Panicle lax; its branches 

 half-whorled, undivided, fpiked. Spikelets nearly feflile, 

 linear, of eight or ten flowers. Outer valve of the corolla 

 hlky at the edges ; inner frmged. Leaves involute. Stipula 

 a'^''"^"^"""'^ '" ^^^ tropical part of New Holland, by 

 Mr. Brown, who doubts whether this be a genuine fpecies 

 of Triodia. Its afpeft is perfedly that of a Poa. 



7. T. pukhella. Kunth as above, n. i. t. 47 Panicle 



leafy, of about three flowers. Spikelets about feveii- 

 flowered. Corolla hairy at the bafe ; its inner valve 



toothed. Scyons trailing. Leaves rough Native of cool 



dry expofed fituations in Mexico, flowering in September. 

 Root fibrous, with trailing runners, taking root as they go, 

 and fending up ferns two or three inches high, folitary or 

 aggregate, whofe fimple panicle is accompanied by many 

 awl-fhaped leaves, refembling the radical foliage. 



8. T. avenacea. Kunth n. 2. t. 48 Panicle clofe. 



Spikelets about fix-flowered. Corolla hairy in its lower 

 half ; inner valve entire. Scyons traihng. Leaves fhghtly 

 hairy. — Native of vaUies in Mexico, flowering in April. 

 This increafes by runners, like the lail. But the Jews are 

 twice as tall ; the fanic/e leaflefs, rather compound, refem- 

 bling a Fejluca; the leaves flat, bluntitli, not unlike Poa 

 annua. 



TRIODION, the title of an ecclefiaftical book in the 

 Greek church, which comprehends the office of a particular 

 part of the year. This book is called Triodion, becaufe it 

 contains the hymns or odes of three flrophes. The hymn 

 of two flrophes is called " Diodion ;" and that of four, 

 " Tetrodion." Leo Allatius. 



TRIOLA, in Geography, a town of the Ligurian re- 

 public ; 18 miles N.E. of Vintimiglia. 



TRIOND, a town of European Turkey, in Albania; 

 1 2> miles W.N.W. of AlefTio. 



TRIONDA, a fmall ifland in the gulf of Satalia, near 

 the coaft of Natoha. N. lat. 36° 36'. E. long. 30^ 26'. 



TRIONES, in AJlronomy, a fort of conftellation, or 

 afliemblage of feven ftars in the Urfa Major, popularly 

 called Charles's IVain. 



From the Septem Triones, the north pole takes the denomi- 

 nation Septentrio. 



TRIONTO, in Geography, a river of Naples, which 



runs into the gulf of Tarento ; 10 miles E. of Roffano 



Alfo, a cape of Italy, on the coaft of Calabria Citra, in the 

 gulf of Tarento, at the mouth of the Trionto. N. lat. 39" 

 46'. E.long. 16° 54'. 



TRIONUM, ill Botany. ( See HfBlscu.s. ) There is a 

 Tfiojov in Theophraftus, faid to be one of the Mallow tribe ; 

 like the Hibijcus in queftion, whofe leaves, having three 

 lobes, are fuppofed to fanftion the prefent application of 

 this name. 



TRIOPHTHALMUS, formed of T^K-, three, and 

 o^a^JL(o.:, eye, a name given by authors to fuch pieces of 

 agate, or other femi-pellucid ftones, as happen to have three 

 iniall circular fpots, refembhng eyes, upon them : thefe are 

 of the nature of the common agate, &c. The fpots are 

 mere accidental varieties in the difpofitions of the veins, and 

 do not make a diilinft fpecies of flone. 



TRIOPIUM, in Ancient Geography, a country or town, 

 or, as otliers fay, a promontory of Caria, near the fea, and 

 belonging to the Cnidians. On this promontory was a 

 temple of Apollo, where the Dorians celebrated games in 

 honour of this god. At this temple was held an afTcmbly 

 of the Dorians of Afia, fimilar to the aflemblics of the 

 European Grceka at Thermopylae. See Cape Citio. 



Oo TRIOP- 



