REEF 



285 



RESIDUAL 



[L. refrango, I 



Reef, (ref). [Riff, the German word.] A range 

 of rocks rising but little above the surface of 

 the water. 



Re-entering angle. One of which the angle 

 points inwards. 



Reflecting, (re-flek'ting). 

 [L. reflecto, I turn back- 

 wards.] R. surface: one 

 which throws back 

 light, heat, <fec. cf. 

 Refraction. R. tele- 

 scopes = Catoptric tele- .Re-entering Angle, 

 scopes: in which the image is reflected from 

 a metallic mirror to the eye-piece. 



Refracted, (re-frak'ted). [L. refractum, broken 

 up.] v. Refraction. 



Refracting, (re-frak'ting). [L. refrango, I 

 break up.] Causing refraction, q.v. R. 

 telescopes=Dioptric telescopes : in which the 

 rays are brought to a focus by refraction 

 through lenses. 



Refraction, (re-frak'shun). 

 break up.] A deflec- 

 tion of rays of light, 

 sound, or heat, when 

 they pass from one 

 medium to another, 

 as from air to water, 

 in a direction oblique 

 to the common sur- 

 face. Double R. = 

 When two rays of 

 light come to the eye 

 from one point in Refraction. 



an object viewed through a doubly-refract- 

 ing substance, such as Iceland spar; one 

 being called the ordinary ray, the other 

 the extraordinary ray. Index of R.: the 

 ratio between the sines of the incident and 

 of the refracted angles; i.e., of the angles 

 which the lines make with the common sur- 

 face of the two media. Prismatic R., v. 

 Spectrum. 



Regelation, (re -je] -a 'shun). [L. re-, again; 

 gelatio, freezing.] The freezing together of 

 two partially thawed substances, as of two 

 pieces of ice. 



Regions of plants. Arranged according to 

 their general character and locality. Iberian 

 R. : evergreen plants in h umid districts. 

 Forschammer's R. of marine plants. &c. 



Regnault, (ra'nault). [M. Regnault.] R.'s 

 hygrometer, v. Hygrometer. 



Regular animals. Burmeister's term for Ra- 

 diata, Bryozoa, and Anthozoa. 



Regulus, (reg'u-lus). [L. regulus, petty king.] 



1. The pure metal 

 obtained by smelting. 



2. The chief star in 

 Leo; also called Cor 

 Leonis and the Lion's 

 Heart. 3. A bird, be- 

 longing to Sylviadae. 



Rein - deer = Cladonia 

 rangiferina : scarce, 

 apparently dying out; 

 the only deer of which 

 bothsexeshavehorns. 



R. period: traces of 



Reindeer. 



which are found in S. of France, intermediate 

 between Paleolithic and Neolithic : marked 

 by remains of rein-deer, mammoth, &c. R. 

 moss=Cenomyce rangiferina : a lichen. 



Reinforce, (re-in-fors'). The thick portion of 

 a gun, near the breech. 



Reiset's bases. 1st B.=Platodiammine, q.v. 

 2nd B.=Platosammine, q.v. 



Relay, (re-la'). [F. relais, relaxation.] A 

 voltaic or magnetic battery which is set in 

 action by one previously at work. 



Relief. In sculpture, the projection of figures 

 from the groundwork. High R.=Alto R., 

 v. Alto-relievo. Low .R.=Bas R., v. Basso- 

 relievo. 



Remains. Human R., v. Human remains. 

 Organic 72.=Fossils, q.v. 



Remora, (rem'6-ra). [L. remora, obstacle.] 

 =:Echeneis remora: a fish which attaches 

 itself temporarily, by a sucking disc, to some 

 large fish, for purposes of locomotion. 



Renaissance, (re-na'sanz). [The French word.] 

 A style of architecture, common in the 16th 

 century, which followed the general use of 

 Gothic ai-chitecture; named from being to 

 some extent a revival of classic styles. 



Renal, (re'nal). [L. renes, kidneys.] Belong- 

 ing to the kidneys. 



Reniform, (ren'i-form). [L. renes, kidneys.] 

 =Kidney-shaped. 



Rennet, (reu'net). [Gerinnan, A.-S. to curdle.] 

 =The inner membrane of Abomasum : used 

 to cause milk to coagulate. Cheese R.= 

 Galium verani. 



Repeating circle. An instrument used for 

 surveying instead of the sextant. 



Reproduction, (re-pro-duk'shun). The re- 

 placing of lost portions, or increase of num- 

 ber, of individuals: the latter takes place 

 when growth begins to cease. Sexual R.= 

 Gamogenesis. Non-sexual R. = Fission, gem- 

 mation, <fec. 



Reptiles, (rep'tilz). [Reptilis, the Latin 

 name.]=Reptilia, q.v. Natural history of 

 R. =Herpetology. 



Reptilia, (rep-ti'li-a). [L. repto, I crawl.] 

 Tortoises, crocodiles, serpents, &c.: verte- 

 brate animals, usually with horny epider- 

 mis, four limbs, and cold red blood ; resemble 

 Mammalia in having an amnion and an 

 allantois, but differ in having each ram us 

 in several pieces and not articulating 

 directly with the skull; also named Lyren- 

 cephala, q.v., and Muscle Animals, q.v. 



Repulsion, (re-pul'shun). Magnetic R.=Dia.- 

 magnetism, q.v. 



Reredos, (rer'dos, or re're-dos). [Arrikre dos, 

 the French name.] A screen, usually of 

 wood or stone, placed at the back of the 

 altar, above it. 



Reseda, (re-se'da)=Mignonette : an herb with 

 small flowers, the type of Resedaceae. R. 

 Zwtea Base rocket. 



Resedaceae, (re-se-da'se-e). [Reseda, q.v.]= 

 Weld-worts : herbs, with fleshy petals, be- 

 longing to Cistales. 



Residual air, which remains in the chest and 

 cannot be expelled=usually about SO cubic 

 inches. 



