QUADRATE 



280 



QUATERNION 



Hartley's Quadrant 



tant. Q. electrometer^ 

 Henley's electrometer: 

 a pith ball suspended 

 beside a metal rod, its 

 divergence from which, 

 when electrified, marks, 

 roughly, the tension of 

 the electricity. 



Quadrate bone, (kwod'- 

 rat). [L. quadratus, 

 squared. ]=Os quadra- 

 turn, v. Quadrat um, Os. 



Quadratic equation, (kwod-rat'ik). [L. quad- 

 ratus, squared.] One in which the highest 

 of the terms are raised to the square or 

 second power. Pure quadratic equation: 

 one in which the square only of the un- 

 known quantity occurs. Adfected quadratic 

 equation: one in which the square and first 

 power both occur. 



Quadrature, Os. A square bone by which 

 the mandible is joined to the skull in birds 

 and reptiles; in Mammalia its homologue is 

 the malleus. 



Quadrature, ( kwod'ra-tur ). [L. quadratus, 

 squared. ]=. Squaring. Q. of circle: the find- 

 ing a square equal in area to a given circle. 

 v. Squaring the circle. 



Quadrilateral, (kwod-ri-lat'er-al). [L. quatuor, 

 four; latus, side.] A 

 general term for any 

 four-sided figure. 



Quadrivalent = Tetra- 

 tonne, q.v. 



Quadrumana, (kwod-ro'- 

 nia-na). [L. quatv.or t Quadrilateral, 

 four; ?/ionus,hand.] Monkeys, apes, baboons, 

 &c. : a sub-division of Mammalia; sometimes 

 used as equivalent to Old World monkeys. 



Quadrumanous, (kwod-ro'ma-nus). [Quad- 

 rumana, <?.v.);=Four-handed. 



Quadrupeds, (kwod'ro-pedz). A general term 

 for four-footed animals ; of which the males 

 are usually larger and fiercer than the 

 females, especially seals and Scotch deer- 

 hoands; fossil remains found from palaeo- 

 lithic times until now. 



Quagmire, (kwag'mlr). [Quake and Mire.] A 

 soft wet piece of land. 



Quagga, (kwag'ga)=Asinus quagga: the wild 

 assof Cape of Good Hope; named from its cry. 



Quail, (kwal). [Caille, the French name.] 

 =Coturnix: a bird be- 

 longing to Tetraonidse. 

 Tufted .=Lophortyx. 



Quails=Perdicidae, q.v. 



Quaking grass = Briza, 



Qualitative, (kwal'i-ta- 

 tiv). [L. qualitas, qua- 

 lity.] Q. analysis: de- 

 termination of the 

 nature of the consti- 

 tuents of a compound. Quail. 

 cf. Quantitative. 



Quality. Q. of heat, term used to express 

 its penetration of various diathermic sub- 

 stances. Q. of sound= Timbre, q.v. 



Quantitative, (kwon'ti-ta-tiv). [L. quantitas, 



extent.] Q. analysis: determination of the 

 relative quantities in which the constituents 

 of a compound are present in it. cf. Quali- 

 tative. 



Quantities. Scalar Q. can be defined by a 

 single numerical specification. Vector Q. 

 require three numerical specifications. 



Quantity. Q. of Voltaic electricity=Curreni 

 strength=Amount of chemical action. 



Quaquaversal, ( kwa-kwa-ver'sal ). [L. qua- 

 qua, on every side; versus, turned.] Q. 

 dip: used of strata inclining in every direc- 

 tion. 



Quarry, (kwor'ri). [Carriere, the French 

 word.] A place where stones are quarried, 

 i.e., excavated and rouphly squared. 



Quartan, (kwor'tan). [Quartanus, the Latin 

 word.] Fourth. 



Quartane, (kwor'tan). [L. quartus, fourth.] 

 =Ethyl, q.v. ; also v. Hydrocarbons. 



Quartation, ( kwor-ta'shun ). [L. quartus, 

 fourth.] Separation of silver and gold, by 

 the solution of the former in nitric acid; 

 named from the gold never being more than 

 J of the whole. 



Quartene, (kwor'ten). v. Hydrocarbons. 



Quarter, (kwor'ter). [L. quartus, fourth.]= 

 28 Ibs.; v. Avoirdupois weight. 



Quarters of the Moon. 1st quarter, half illu- 

 minated. 2nd quarter, full Mo,on, the side 

 turned to us being fully lighted. 3rd quar- 

 ter, half illuminated. 4th quarter, new 

 Moon, almost wholly obscured. 



Quartine, (kwor'tin). [L. quartus, fourth.] 

 =Crotonylene.: 4^, q.v.; also v. Hydro- 

 carbons. 



Quartone, (kwor'ton). [L. quartus, fourth.] 

 v. Hydrocarbons. 



Quartune, (kwor'tun). [L< quartus, fourth.] 

 v. Hydrocarbons. 



Quartz, (kwortz'). [Quarz, the German word.] 

 =Spar: native silica, a mineral crystallising 

 in hexagons; infusible, and insoluble, ex- 

 cept in hydrofluoric acid; when pure, colour- 

 less. Amethyst, cairngorm, cornelian, agate, 

 onxy, &c., are varieties of quratz. 



Quartzite, (kwort'sit). [Quartz, <?.v.]=Qnartz- 

 rock: a com pact granular metamorphic rock, 

 containing crystals of quartz. 



Quassia, (kwos'si-a). [Quasu, who first used 

 it.] A plant belonging to Simarubaceac, 

 found in tropical America. Q. a mara= Bit- 

 ter wood. 



Quassiads, ( kwos'si-adz ). [Quassia, q.v.]= 

 Simarubaceae. 



Quassin, (kwos'sin). [Quassia, g.v.]=Quassite: 

 CioHjaOs: the bitter principle of quassia. 



Quata. v. Ateles. 



Quaternary, ( kwa-ter'na-ri ). [L. quaterna- 

 rius, containing four.] Post Tertiary, and 

 all subsequently deposited rocks. 



Quaternions, (kwa-ter'ni-onz). [L. quaterna- 

 rius, containing four.] A branch of mathe- 

 matics, applicable to three dimensions, by 

 means of the product or quotient of two 

 lines or vectors, depending on a system of 

 four geometrical elements, and expressible 

 by quadrinomial symbols; also called Hamil- 

 ton's triangle. 



