TIB 



n? 



TOB 



sonorous ; very ma!!rablc ; but not very 

 tenacious. Sp. gr. 7'29. Melting point 

 442 F. It enters into fusion with other 

 metals; as with lead, forming pewter, and 

 with copper, forming the various sorts of 

 bronze, and bell-metal. 



TIN'AMCS, \ A genus of American birds 



TIN'AMOUS. J remarkable for a very long 

 and slender neck, covered with feathers, 

 the tips of whose barbs are slender and 

 slightly curled, which gives a very pecu- 

 liar air to that part of the plumage. Order 

 Gallinaceai, Cuv. The species vary in size 

 from that of a pheasant down to that of 

 a quail, or even smaller. They either 

 perch on low trees, or hide among long 

 grass. The generic name is Latinised 

 from the native name tinamou. 



TIN'CAL. A name of crude borax, as it 

 is imported from the East Indies, in yel- 

 low greasy crystals. 



TIXC'TURE, Lat. tinctura, from tingo,to 

 dye. A term used by apothecaries to de- 

 signate a solution of any substance in 

 dilute alcohol, or alcohol impregnated 

 with the active principle of a vegetable 

 or animal substance. 



TI'NEA. The name of a genus of noc- 

 turnal Lepidoptera. The caterpillars of 

 the true tinea construct portable sheaths 

 or habitations from the materials on 

 which they reside. Name rama, a moth- 

 worm. 



TIN'FOIL, from tin and folium, a leaf. 

 Tin extended under the hammer into thin 

 leaves. 



TIN-GLASS. A name of bismuth. 



TIN-PLATE. "White iron. Thin sheet- 

 iron coated with tin. In this case the tin 

 forms in some measure an alloy with the 

 iron. 



TIN-PYRI'TES. A native sulphuret of 

 tin, containing usually some copper and 

 sometimes iron. This ore of tin is of a 

 yellowish-gray colour, metallic lustre, and 

 a fibrous structure. 



TIN-STONE. A native oxide of tin, found 

 only in Cornwall. This is perhaps the 

 richest ore of tin, yielding sometimes 80 

 per cent, of the metal. It occurs both 

 massive and crystallised. 



TIP'CLA. The Crane-fly : a genus of dip- 

 terous insects of the family Nemocera. 

 The tipula of the Latins was a species of 

 aquatic spider. The legs of the tipulae 

 are disproportionably long, as is well 

 seen in the T. silvestris or Father- long-legs. 



TIKE. In mechanics, a band or hoop of 

 iron, used to bind the fellies of wheels, to 

 secure them from wearing and breaking. 



TIRO'NIAN NOTES. The short-hand of 

 Roman antiquity. 



TIS'RI. The first Hebrew month of the 

 civil year, and the seventh of the eccle- 

 siastic : it answered to a part of our Sep- 

 tember and October. 



TIS'SUB, Fr. tissti, woven, from titter 

 to weave. 1. Cloth interwoven with gold 



and silver, or brilliant-coloured yarns. 



2. A term introduced by the French into 

 anatomy, to express the textures which 

 compose the different organs of animals. 



TITAN'IC ACID. A name for the per- 

 oxide of titanium, which exists combined 

 with alittle oxide of iron and manganese. 

 is the mineral known by the names of 

 titanite and rutile. 



TiTA'NirM. A rare metal discovered by 

 the Rev. Mr. Gregor, in mcnachanite, in 

 1791, and by Klaproth,in red schorl, in, 

 1795. Gregor named it menachine, from 

 the mineral in which he discovered it, 

 and Klaproth named it titanium, from 

 r<rs?. The metal may most readily be 

 procured from its chloride, by passing a 

 continuous stream of ammoniacal gas over 

 it. When thus prepared it is a fine pow- 

 der, which, on being heated in the air, 

 takes fire. It is sometimes observed crys- 

 stallised in small cubes, in the slag of the 

 hearth in the great iron smelting fur- 

 naces. These crystals are very brittle, 

 and so hard as to scratch steel. Sp. gr. 

 5'3. Traces of titanium may be disco- 

 vered in many irons, wrought as well a 

 cast. 



TITHE. The tenth part of .anything: 

 appropriately the tenth part of the in- 

 crease annually arising from the profits of 

 land and stock, allotted to the clergy for 

 their maintenance. Tithes are personal, 

 when accruing from labour, art, trade, 

 and navigation ; predial when issuing from 

 the earth ; and mired when acoruins from 

 beasts fed on the ground The term is- 

 Sax. teoica, from teogeiva, a tenth. 



TI'THING. In law, a. decennary: a com- 

 pany of ten householders, who, dwelling 

 near each other, were held free pledges 

 to the king for the good behaviour of 

 each other. The institution of tithings in 

 England is ascribed to Alfred. 



TIT'ULAR. In ecclesiastics, a person in- 

 vested with the title to a benefice. 



TME'SIS, from Tt^vw, I cut. In gram 

 mar, a figure by which a compound word 

 is separated into two parts by the inter- 

 vention of one or more words, as qitee men 

 ctuique, for qiHtcunqiie mea. 



TOAD'STONE. A provincial name for a 

 variety of trap rock, found very abun- 

 dantly in Derbyshire. It takes this name 

 from a supposed resemblance in its cene- 

 ral aspect to the exterior of a toad It 

 may, however, be a corruption of the 

 German todstein, which in mining lan- 

 guage means a rock unproductive of 

 mineral treasure : a character applicable 

 to loadstone. 



TOBAC'CO. The dried leaves of the JVi- 

 crtiana tabaaim. a plant indigenous t<? 

 America, but which may bo advantfe- 



