T H E 



nition, this fpecies differs from the laft only in having more 



numcrous^/^ow^'j-. 



7. T\\. angujlifolia. Narrow-leaved Thelyttiitra. Br. n. 6. 



" Outer fegments of tlic liood phimous ; iiUermt'dlatc one 



naked at the hack, cmarginate, with toothed lobes. Spike 

 of few flowers. Leaf as tall as the flowcr-dalk." — Found 

 by Mr. Brown, in tlie neiglibourhood of Port Jackfon. 



8. Th. carnea. Flefli -coloured Thelymitra. Br. n. 7. 



" Calyx and petals fpreading. Outer fegments of the 



hood finely toothed, beardlefs. Stalk with one or two 



flowers." Found by Mr. Brown, near Port Jackfon. A 



drawing in our pofTeflion, which feems to belong to this 

 fpecies, reprefents the Jialh about four inches high, with a 

 light-red terminal ^ow«-, above an inch wide, and a few 

 fhort, radical, lanceolate leaves. 



9. Th. -vemfa. Veiny Thelymitra. Br. n. 8.—" Calyx 

 and petals converging. Outer fegments of the hood beard- 

 lefs, fpirally involute." — Gathered alfo near Port Jackfon, 

 by Mr. Brown. 



10. Til. tigrina. Tiger-fpotted Thclymiira. Br. n. 9. 



«' Lateral fegments of the hood diftinft, with tufted beards ; 



intermediate one (hortcr, crefted. Leaves linear, channelled." 



Difcovered by Mr. Brown, on the fouth coaft of New 



Holland. ThQjlowcrs are yellow, with darker fpots. 



1 1 . T\\. ftifco-liitea. Brownirti-yellow Thelymitra. Br. n. 10. 

 — " Lateral fegments of the hood converging, connefted, 

 fringed ; intermediate one erect, naked. Leaves lanceolate." 

 — Gathered by Mr. Brown, in the fame country with the 

 tigrina. He defcribes the yellow colour of the Jlowers as pe- 

 cuhar to thefe two laft fpecies ; all the reft, as far as hitherto 

 difcovered, having them generally blue, fometimes white, or 

 flefli-coloured. We have neceflarily, for want of authentic 

 fpecimcns, except of the firft two fpecies, adopted the fpe- 

 cific charadlers of the excellent author whofe name we have 

 cited. — He eftablifhes a genus under the name of Epiblema, 

 whicli appears to differ from Thelymiira, in having a ftalked 

 lip with tufts of fibres at its bafe ; an appendage to the bafe 

 of the column, connefted with the claw of the lip under*, 

 neath ; and the anther accompanied at each fide by a petal- 

 like lobe. Of this there is only one fpecies, E ■ grandiflovuvi, 

 found on the fouth coaft of New Holland. Its Jlowers are 

 large, blue, and handfome. 



THELYPHONON, from driKvf, female, and ®ovo,-, murder, 

 or deJlruBion, the name of an herb mentioned by Pliny, 

 book 25, chap. 10, which he fays is by fome called Scorpion, 

 from the refemblance of its root to afcorpion, and the touch 

 of which is fatal to that animal, as a remedy for whofe fting 

 it is given internally. He adds, that the fame root kills any 

 fort of quadruped, if apphed to the parts of generation ; 

 and that its leaf, which refembles that of Cyclamen, produces 

 the fame effeft within the courfe of a day. His defcription 

 soiwento the Doronleumfcorpioides, Wiild. Sp. PI.V.3.ZI 14; 

 D . latifolium, Cluf. Hift. v. 2. 16; Great Leopard's-bane, 

 Ger, Em. 759 ; but there is apparently much fuperftition, 

 miftake, or exaggeration, intermixed in his relation. 



THELYPTERIS, h-omf^n-kvc, female, mA irli^i;, a fern, 

 a name by which Pliny defignates a fpecies of the Fern tribe, 

 whofe habit appears to be more delicate than that of his Filix 

 mas,cT Male Fern. The latter fhould feem, by his defcription, 

 to be our Pterts aquilina. (See Pteris. ) Tlie name of 

 Filix mas, however, has remained with a large fpecies of 

 Jifpidium, Sm. Fl. Brit. II2I. Engl. Bot. t. 1458; and 

 that of Filix fcemina with a more flender and finely-divided 

 one of the fame genus, Engl. Bot. t. 1459 : while a third, 

 whofe texture is more thin and tender than either, has received 

 the appellation of Affidium Thelypteris, They were all 

 /rfcrred by I-innseus, under the fame fpecific names, to 



Vol. XXXV. 



THE 



PoiATOmuM. ( See tliat article. ) Owr ^rcknt Thelypteris, 



therefore, muft not be taken for that of Pliny, being rather 

 a north-country plant, not hitherto noticed in Greece by any 

 botanical traveller. 



THEMA, in Ancient Geography, a town of Syria, in the 

 Chahbonitide territory ; and alfo of Arabia Deferta. 



THEM AN, a town of Arabia Petraea, 5 miles from Pe- 

 tra, which had a Roman garrifon. — Alfo, a town of Judea, 

 in the half-tribe of Manaifeh, on the other fide of Jordan ; 

 famed foi- the wifdom of its inhabitants. EJiphaz, one of 

 Job's three friends, came from this place. 



THEMAR, in Geography, a town of Germany, in the 

 county of Henneberg, on the Werra ; 1 2 miles S.E. of Mei- 

 nungen. 



THEME, Thema, a fubjeft or topic, upon which to 

 write or compo/e. 



Theme, among AJlrologers, denotes tlic figure they con- 

 ftruft when they draw the horofcopc ; reprefenting the ftatc 

 of the heavens for a certain point, or moment, required ; i. e, 

 the places of the ftars and planets for that moment. 



The celeflial theme confills of twelve triangles, inclofed 

 within two fquares, and called the tivelve hotifes. 



Theme, in Grammar, denotes a verb, confidered in its 

 primary and abfolute fenfe, and not limited to any particular 

 mode or tenfe : or it is the verb in its primitive radical ftate, 

 whence its different formations are derived. 



Theme, in Mufic ; Thcma, Lat. ; Tema, Ital. ; Moltivo, Sag- 

 getto, is a feries of notes felefted as the text or fubjeft or a 

 new compofition, or an old favourite and well-known air to 

 grace and embelhfh with variations. About the middle of 

 the laft century, the mufical world was overwhelmed with 

 dull, unmeaning, and monotonous variations to old and new 

 tunes, which confilled of nothing more than a regular multi- 

 plication of notes, without fancy, talle, or harmonical re- 

 fources ; till Haydn, in the flow and graceful middle move- 

 ments of his quartets and fymphonies, by a richnefs of ima- 

 gination, by double counterpoint, and inexhauftible refources 

 of melody and harmony, rendered variations the moft inge- 

 nious, pleafing, and heart-felt of his admirable produftions 

 a grand orchejira ; and Mozart, in a totally different ftyle, and 

 for a totally different purpofe, has rendered little favourite 

 French, Itahan, German, and Enghfh airs the moft beauti- 

 ful, amuiing, and ufeful compofitions for the piano forte that 

 have ever been produced fince the invention of that inftru- 

 ment. More than twenty of thefe have been printed in 

 England that were brought from Vienna by Mrs. Peploe, 

 who played them, as ftie did all other mufic, with a firmnefs, 

 accuracy, and fpirit, which neither dilettante nor profeffor 

 has ever exceeded. 



Thefe themes feem to have been a feries of leffons, com- 

 pofed exprefsly to form the hand and tafte of fome difciple 

 of the author, who promifed to be a great performer. In 

 everyone of thefe themes, there are fome peculiar difficulties 

 of execution, refinement, and expreffion to vanquifti, at 

 which it is in vain for mediocrity to afpirc. 



THEMEDA, in Botany, a genus of graffes, fo called 

 from its Arabic name Thicmcd. — Forfli. ^gypt-Arab. 178. 

 Juff. 447 — It is found in Yemen, near Hadie. Forlkall 

 names the only fpecies T. IriiinJra, and defcribes it as 

 follows. 



X. " A polygamous grafs. Spilclels proceeding from a (heath, 

 capitate ; the cuter ones whorled, male. Calyx of one valve, 

 fingle-flowcred. Corolla of two valves. Styles and anvns 

 wanting. In the middle of the head of flowers arifes a flwrt 

 ftalk, bearing two ilalked male fpilrkts, and a feffile herma- 

 phrodite one ; the calyx is of one valve, corolla of two ; atUK 

 proceeding from the receptacle, much longer than the flower. 



3 N Stemt 



