TEIDJE 



322 



TENSION 



ments of the skin, found in the mouth of 

 higher animals: used for prehension and 

 mastication; classified as molars, pnemol.us. 

 canine, and incisors, q.v. Man has twelve 

 molars, eight praemolars, four canine, and 

 eight incisors. Golden T. t v. Golden teeth. 

 Involute T., v. Involute teeth. Laniary T. 

 = Canine T. Milk r.=peciduous T.: tem- 

 porary teeth appearing in infancy, and re- 

 placed by permanent teeth. 



Telda, (te'i-de). [Teius, the typical genus; 

 Gk. eidos, form.] A family of lizards. 



Telegram, (tele-gram). [Gk. tele, far off; 

 gramma, a writing.] A message conveyed by 

 means of telegraphic apparatus; especially 

 one in which words are written by the 

 apparatus or by hand. 



Telegraph, (tel'e-graf). [Gk. tele, far off; 

 gnt/>/to, 1 write.] An apparatus for the rapid 

 conveyance of intelligence, cf. Semaphore. 

 Electro T., v. Electro-telegraph. Morte's T., 

 v. Morse's telegraph. T. batteriet: usually 

 Daniell's, Le Clanche, or Marie Davy's. 



Teleology, ( tel-e-ol'6-ji ). [Gk. telot, end; 

 logos, discourse.] The science, or study, of 

 final causes. 



Teleosauria, (tel-o-o-saw'ri-a). [Teleosaurus, 

 q.v.] Extinct animals, of which the teleosau- 

 rus is the type. 



Teleoiaurus, (tel-e-fl-saw'rus). [Gk. teleot, 

 complete; saura, lizard.] A marine croco- 

 dile, known only by fossil remains in Oolite. 



Teleostei, (tel-e-os'te-i). [Gk. teleot, perfect; 

 osteon, bone.]=Bony fishes: a primary divi- 

 sion of fishes, including most of the existing 

 genera of bony fishes. 



Telephone, (telWon). [Gk. tele-, far off; phone, 

 sound.] An apparatus by which sounds can 

 be conveyed through long distances, being 

 converted into electricity and reconverted 

 into sound. 



Telephorida, (tel-e-forl-de). [Gk. tele-, fur off, 

 phoreo, I carry.] A family of insects, belong- 

 ing to Larnpyridte; also called Soldiers and 

 Sailors. 



Telerpeton, (tel-er'pe-ton). [Gk. tele-, far off; 

 herpeton, reptile.] A reptile, known only by 

 fossil remains found in Triassic rocks. 



Telescope, ( tel'es-kop ). [Gk. tele-, far off; 

 ni-opeo, I view.] An appa- 

 ratus for the better obser- 

 vation of objects at a dis- 

 tance, especially of celes- 

 tial objects. Astronomical 

 T.: adapted to observa- 

 tion of heavenly objects. 

 Catoptric T. = Reflecting 

 T., q.v. Dioptric T.= 

 Refracting T., q.v. Gali- 

 lean T., v. Galilean tele- 

 scope. Gregorian T., v. 

 Gregorian telescope. Her- 

 schelianT.,v. Herschelian Telescope, 

 telescope. Newtonian T., v. Newtonian tele- 

 scope. 



Telford's gradient, v. Gradient. 



Tellurates, (tel'lu-rats). [Telluric, q.v.] Com- 

 pounds of telluric acid, with bases. 



TeUuretted hydrogen, (tel-lu-ret'ed). [Tellu- 



rium, g..] = Dihydric tt-lluiidc H.,T, : r\ 

 combustible gas, wit hslightl) ;u-i<i pi. ; 



Tellurethyl, (tel-u-re'thil). [Tellt- 

 </.v.]=C4HioTe: a feebly-acid gas, with fa-till 

 odour. 



Telluric, ( tel-lfi 'rik ). [Tellurium, q.v.] 

 Relating to tellurium, or containing it as 

 an important constituent T. acid = H 2 TeO 4 : 

 a crystalline substance. T. iron: iron ore con- 

 taining tellurium. T. i2ver=Hessite, Q.V. 



Tellurides, ( tel'lu-ridz ). [Tellurium, o.v. ] 

 Rare substances, compounds of tellurium 

 with another element. 



TeUurites,(tenu-ritz). [Telluroua.g.v.] Com- 

 pounds of tellurous acid with bases. 



Tellurium, (tel-lu'ri-um.) [L. ttllus, the earth.] 

 =Te": one of the sulphur group: a rare nie- 

 tallic-hke substance, resembling sulphur in 

 its properties. Graphic r.=Sj'lvamte. 



Telostei=Teleostei, q.v. 



Telson, (tel'son). [Gk. ttlton, limit.] Tho 

 centre of the terminal somite in Cm-- 



Tempera, (tem'ptr-a)=Distemper. I'.untint; 

 \\itli o|>aque colours mixed with ei. 

 Fresco, v. Painting. 



Temperament, ( tem'pgr-a-ment ). A slight 

 alteration in two musical notes very n -.uly 

 alike so as to make one sound serve for hoth: 

 as when F sharp and G flat are n -\ -\ 

 by the same sound. 



Temperate, ( tem'per-at ). [L. temperatus, 

 moderate.] Moderate. T. zonet: Ijetwmi the 

 tropics and polar circles, v. Zones. 



Temperature, (tern 'p?r-a-tur). [L. lem-peratus, 

 moderate.] Intensity of radiant heat. v. 

 Thermometer. 



Tempered. 7. steel.- steel hardened by being 

 suddenlv cooled when heated. 



Temporal, (tem'por-al). [L. tempera, fon-h. .nl.] 

 T./oMa.-ahollowin which the temporal ma*, lu 

 lies. 



Temporary stars; those which become visible 

 for a time, usually by a temporary n 

 of brightness. 



Tench, (tensh). [Tinea, the Latin name.]= 

 Tinea, q.v. 



Tendo Achiilis,(t !,- 

 do fi-kil Us). [The : 

 LAtin name. ] A ; 

 tendon connecting 

 the heel and calf of 

 the leg. Tench. 



Tendon, (ten'don). [L. tendo, I stretch.] 

 Cords of fibrous tissue connecting the musc'lc.s 

 with the bones, &c. cf. Ligament. 



Tendrac, (ten'drak)=.Tenrec, q.v. 



Tendril, (ten'dril). [Tendrillon, the French 

 word.] Elongated thread-like processes of 

 l>l.-ints, especially of climbing plantn, wliich 

 twist round other plants, trellis-work, &c. 



Tenebrio. T. molitm-. flour beetle. 



Tennantite, ( ten'nan-tit ). [ Tennant. ] A 

 variety of copper pyrites. 



Tenrec, (ten'rek)=Centete3: a hedge-hog like 

 animal belonging to Insectivorn. 



Tension, (ten'shun). [L. (>,,<lo, I stretch.] 

 Kxp;ti)sibility, or elastic force, of gaseous 

 bodies. Electric r.=Electro-motive force= 

 Intensity of chemical action. 



