THISTLE 



326 



THYSANOPTERA 



Thistle, (this 7 !). [ThisUl, the A.-S. word.]= 



Carduua : a plant 



belonging to Aster- 



aceae. Cotton T.= 



Onopordon. Plume 



:T.=Cuicus. Sow 



2*.=Sonchus. Star 



T.=Ceutaurea cal- 



citrapa. 

 Thlaspi, (thUs'pi). 



[Gk. t/ilan, I com- 

 press. ] = Penny 



Cress, an herb, be- 

 longing to Brassi- 



cacete. T. amuse 



=Mithridate mustard. 

 Thomson's electrometer. fSir W. Thomson.] 



A combination of a Ley den jar and * sus- 

 pended needle, the deflection of which is the 



measure of electrical tension. 

 Thomson's galvanometer. Its indications are 



given by reflection on a graduated scale, of a 



ray of light. 

 Thoracic duct, (th5-ra'sik). (Thorax, q.v.] 



The main trunk of the lymphatic system, a 



largo tube in front of the back bone. 

 Thorax, (tho'raksX [Ok. thorax, breast-plate.] 



1. In insects, the three segments supporting 



the leg. 2.=Thechest. 

 Thorina, (tho-ri'na). (Thorite, $.r.]=ThOa= 



Dioxide of thorinum. 

 Thohnum, (thd-rrnum). (Thorina, 9.r.]=Th': 



a rare metal obtained from thorite; also 



called Thorium. 

 Thorite, (thd'rit). (Thor, a Norwegian deity.] 



A resinoua mineral, from which thoriuum is 



obtained. 

 Thorn, (thorn). (The A.-S. name.] A general 



term I<T hawthorn and 



white thorn, v. Crataa- 



gua. T. apple= Datura. 



T. 6ac*=Raia clavata: 



a fish. 

 Thorough-base. A method 



of writing a harmony, 



in which the notes of 



one part only are writ- 

 ten, the relations of the , 



other parts to this base 



being expressed by figures. TbornUck 

 Thousand-legs=Millipedes, q.v. 

 Thread, (thred). (Thrad, the A.-S. name.] 



T. cells: thread-like stinging processes found 



in liydrozoa, Ac. T. wornu=Nematoidea, 



q.v. T. of tcreiD: the projecting worm-like 



portion. 

 Three-fourth oxides. Of the type H 3 O 4 : in 



which three atoms of a metal combine with 



four atoms of oxygen. 

 Three, Rule of = Proportion. An arithmetical 



process by which the fourth of a series of four 



proportional numbers is found when the 



other three are given. 

 Thrift, (thrift)=Armeria maritima: an herb 



belonging to Plumbaginaceac. 

 Thrips, (thrips). An insect, the type of 



Physopoda, g.v.=Thysanoptera. 

 Throstle, (thros'l). (1. The A.-S. word; 2. 



Named from its sound when working. ]= 



Song-thrush=Turdus musicus. T. frames* 



Water-spinning frame. 

 Throttle valve. A valve working in a pipp, 



soas to regulate the quantity of ft run. M.IUT, 



Ac., passing through in a given time. 

 Throw=Fault, (7.1*. 

 Thrush, (thrush). (Thrysce, the A.-S. nam.- ] 



=Turdus. a small 



bird belonging to 



Merit lida>. Sonff 



T. =Turdus musi- 



cus; also called 



Throstle. T.fun- 



OK4=Oidium al- 



bicans: found in 



infantile disease. 



of the thrash. 

 Thrutchers. Aux- 



iliary high pres- 



sure non-condensing engine. 

 Thuban=a Draconis : formerly the brightest 



star in the constellation, now of only thir.l 



magnitude. Some 5000 years since it \v.-w 



tfct pole-star. 

 Thuja, (thu'ja). (Gk. thyan. odour.] A tree be- 



longing to Ooniferm; also callc<i 

 Thumb, (thum). (Thuma, the A.-S. word.] = 



Pollex: opposable in man, monkeys, and 



lemurs. 

 Thunder, (thnn'd?r). (The A.-S. word.] An ex- 



plosive sound sometimes following lightuing. 

 Thuringite. An ore of iron. 

 Thuya, (thu'ya)= Thuja, o.v. 

 Thuytcs. (tht'tez). (Thuja, q.v. ]=T1 



a coniferous plant, known by fossil reiiiun.H 



found in Oolitic rocks. 

 Thwaites' fluid. For preserving animal MI!>- 



stances: a compound of water, alcohol, 



creosote, and chalk. 

 Thylacine, (thi'la-sin). [Ok. thylakos, pouch : 



kyon, dog.] The most carnivorous of mu- 



supialian animals. T. cynocephalus=.T;ia- 



manian wolf. 

 Thy lac other ium, (thT-]a-ko-the'ri-nm)=Am- 



phitherium: an extinct maruspial ;iiiini,il. 

 Thymallus. A salmon-like fish belonging to 



Salmouidaa. T. ru/7am=Graylin:.'. 

 Thyme, (t'm). [Thynius, 9.r.]asThyinu8, 



Oil of T.: a c 



mene, q.v. 

 Thymelaceae. ( ti-me-la'se-5 ). [ Thymel.va = 



Daphne. ]=aDaphnads: shrubs, with c;i\istic 



bark, belonging to Daj)hnales. 

 Thymene, (ti'men). (Thymus, 7.r.]=C]nIIi4t 



a solid crystalline hydrocarbon found in oil 



of thyme. 

 Thymol, (ti'niol). (Thymus, tf.r.]=Oxidised 



thyraene=CioH 14 O. v. Thyniene. 

 Thymus,(ti'mus). [TheGreek name.]=Thyme: 



a small fragrant herb, belonging to I.aini- 



.xcese. T. plant! : at the base of the heart; 



gradually disappears with age. 

 Thyroid, (thi'roid). (Gk. thyra, door; eiilos, 



form.] T. gland: below the larynx, the use 



of which is not clearly known. T. cartilage: 



a V-shaped piece of gristle partially enclosing 



the glottis, and attached to the top of the 



windpipe; also callad Adam's apple. 

 Thysanootera, (thi-san-op'te-ra). [Gk. thy- 



, <?.?. 

 thy- 



