RESILIENCE 



286 



RHEOSTAT 



Resilience, (re-zil'i-ens). [L. retilio, I spring 

 back. ]= ReboundinB=Elasticity. 



Resins, (rez'inz). \Resina, the Latin word.] 

 Brittle inflammable substances obtained 

 from plants, mostly oxidised essential oils: 

 when subjected to friction they become elec- 

 tric. Fossil R. : amber, asphalt, ozocerite, &c. 



Resinous electricity = Negative electricity: 

 developed on resinous surfaces by friction. 



Resist pastes, Substances used in dyeing to 

 prevent the colouring matter acting on the 

 parts where they are applied. 



Resistance, (re-zis'tans). Electric R. : the 

 force required to electrify a given body, and 

 therefore the resistance to the passage of a 

 current. Unit of R. : Jacobi's, French, 

 Ohm's, Ac.: r. Electro-magnetic unite. 



Resonance, (rez'o-nans). [L. retono, I resound.] 

 The prolongation of sound, v. Sound. 



Resorcin, (re-sor'sin). [Orcin, g.v.^CgHgOo' 

 :i white crystalline substance. 



Respiration, (res-pi-ra'shun). [L. retpiro, I 

 breathe again.] The removal from the 

 blood of carbonic acid and steam, and the 

 transfer into it of oxygen; effected by lungs 

 or branchiae. 



Respirative, (re-spi'ra-tiv). [Respiration. <?.r.] 

 Performing respiration. R. animals; Okeu's 

 term for Articulata. 



Respirator, ( res-pi-ra'tor ). [L. retpiro, I 

 breathe again.] An apparatus for warming 

 the inhaled fresh air by means of the heat 

 contained in the exhaled breath. 



Rest-harrow - OiiMiiis : named from its long 

 roots arresting the harrow. 



Restiaceae, (res-ti-a'se-e) = Cord leaf* : herbs, 

 with glumaceous flowers, belonging to Glu- 

 males. 



Resultant, (re-zul'tant). [L. retulto, I leap 

 back.] In dynamics: the force arising from 

 two or more combined forces acting on one 

 point; which is equal to their sum only when 

 they act in the same straight line, and in the 

 same direction. 



Retene, (ret'en)=CigH 18 : a hydrocarbon, ob- 

 tained in the distillation of coal tar: also 

 called Tetramethyl anthracene. 



Reticulate, (re-tik'u-lut). [L. reticulum, small 

 net.] The same as fibrous, 

 but with the fibres cross- 

 ing each other irregu- 

 larly. 



Reticulum, (re-tik'Q-lum). 

 {L. reticulum, small net.] 

 The 2nd stomach of Rumi- 

 nants; named from its 

 honeycombed structure. 



Retina, (ret'i-na). [L. rete, Reticulate leat 

 net.] The termination of the optic nerve, 

 which spreads over the interior of the eye- 

 ball in a thin layer, which can be affected so 

 as to cause the sensation 

 of sight. 



Retort, (re-tortO- [L. re- 

 tortus, bent back.] A 

 vessel, usually of glass, 

 consisting generally of a 

 bulb and long neck; used Retort. 



fpr distilling in chemical operations. 



Retrenchment, (re-trench'ment). A work of 

 fortification constructed within, or behind, 

 another. 



Return shock. In electricity; v. Shock. 



Retuse, (re-tus^. [L. rftusus, blunted.] Very 

 blunt. 



Retzius's division of the human race 

 With long heads=Dolichocephali. 

 With short heads=Brachycep)i;Ui. 



Revetment, (re-vet'ment). [Ret element, the 

 French word.] A facing of wood, stone, etc., 

 used to give permanence to the steep incline 

 of an embankment. 



Revolutions of the Moon. Nodical R. in 27d. 

 5h. Cm., in which the Moon revolves round 

 the Earth. Synodical R. in 29d. 12h. 44in., in 

 which the Moon returns to the same position 

 relatively to the Sun. Every 18 years l!> 

 days the Sun, Moon, and Earth return to 

 precisely the same relative positions; this 

 period was called Saros by the ancient 

 astronomers. 



Revolver, ( re-vol'ver. ] A fire-arm with a 

 number of chambers fitted to ono barrel, so 

 that, all being loaded, they can be discharged 

 in rapid succession. 



Reynard, (ru'nard). [Ger. regin, thought; 

 hart, strong.] = Fox, q.v. ; named from its 

 cunning. 



Rhabdammina, (rab-dam'min-Ji) fGk. rhab- 

 dos, rod.] R. abyssorum: a bright orange 

 rhizopod, very hard; its case contains phos- 

 phate of iron, the only example known. 



Rhabdocoeli, (rab-do-sC-li). [Gr. rhabdo*. rod.] 

 Used by Siebold for a sub-division of Turbel- 

 larii: animals having elongated and rounded 

 bodies. 



Rhaetic beds, (re'tik). [Rhnetia, in Lombardy.] 

 =Penarth beds of England = Fossiliferoua 

 beds of limestone between the Trias and Lias 

 foi iiiations. 



Rhamnaceae, (ram-na'se-C). [Rhamnus, q.v.} 

 =-Rhamnads: shrubs and trees belonging to 

 Rhamnales. 



Rhamnales, (ram-na'15z). [Rhamnus, q.v.] 

 Plants, with monodichlamydeous flowers 

 and compound ovary, forming a division of 

 Perigynous Exogens. 



Rhamnus, (ram'nus). [Gk. rhamnox, white 

 thorn.] = Buckthorn : a shrub, with small 

 flower, the type of Rhamuaceaj. R. fran- 

 grZa=Berry-bearing alder. 



Rhamphastidae, (rani-fas'ti-de). [Gk. rliam- 

 phos, bird's beak.] = Toucans: birds with 

 very large beaks, belonging to Scansores. 



Rhamphorhynchus, (ram-for-ing'kus). [Gk. 

 rhamphoi, bird's beak; rhyrjchos, beak.] A 

 pterosaurian, or flying-lizard ; of which re- 

 mains are found in Oolite rocks. 



Rhea, (re"a). l.=Rheas: a bird belonging to 

 Struthionidae ; called American ostrich. 2. 

 A star. 



Rheadic, (re'a-dik). R. aeuZ=Papaveric acid. 



Rheas. v. Rhea. 



Rhenite, (ren'it). [River Rhine.] A mineral, 

 chiefly hydrated phosphate of copper. 



Rheostat, (re'6-stat). [Gk. rheos, current; 

 statos, standing.] An instrument for mea- 

 suring the resistance of any given substance 



