GLOSSARY. 



muscles by which they contract 

 on the application of an exciting 

 cause. 



Irrup'tion (Lat. in, in; rumpo, I 

 break). A breaking in. 



I'sagon (Gr. iffos, isos, equal ; yuvia, 

 gonia, an angle). A figure with 

 equal angles. 



Ischiat'ic (Gr. io~xtov, is'chion, the 

 hip). Belonging to the hip. 



ISO- (Gr. laos, isos, equal). A prefix 

 in compound words, denoting 

 equality. 



Isobaromet'ric (Gr. lo-os, isos, equal; 

 barom'eter). Applied to lines con- 

 necting places on the earth's sur- 

 face which present the same mean 

 difference between the monthly 

 extremes of the barometer. 



Isochei'mal (Gr. lo-os, isos, equal ; 

 X 6 '/* * cheima, winter). Having 

 the same winter temperature. 



Isochromat'ic (Gr. lo-os, isos, equal ; 

 Xpw^Oj chroma, colour). Having 

 the same colour. 



Isoch'ronal (Gr. i<ros, isos, equal ; 

 Xpovos, chronos, time). Uniform 

 in time ; occurring in equal times. 



Isoclin'ic (Gr. icros, isos, equal ; 

 K\ivca, Tdino, I bend). Bending 

 equally ; applied to curves in the 

 earth's surface in which the dip of 

 the magnetic parallels is equal. 



Isodynam'ic (Gr. i<ros, isos, equal ; 

 Swa/jLis, du'namis, power). Of 

 equal power ; applied to lines on 

 the earth where the magnetic in- 

 tensities are equal. 



Isogeother'mal (Gr. lo-os, isos, equal ; 

 777, ge, the earth ; 6ep/j.os, thermos, 

 warm). See Isothermal. 



Isogo'nic (Gr. <Vos, isos, equal; 

 ytavia, gonia, an angle). Having 

 equal angles ; applied to lines on 

 the earth's surface in which the 

 magnetic needle has the same de- 

 clinations. 



Isohyeto'ses (Gr. Icros, isos, equal; 

 uTos, hu'etos, rain). Lines con- 

 necting places on the surface of the 

 globe where the quantity of rain 

 which falls annually is the same. 



Isomerlc (Gr. lo-os, isos, equal ; 

 ptpos, meros, a part). Consisting 

 of the same elements in the same 

 proportions, but possessing different 

 physical and chemical properties. 



Isom'erism (Gr. laos, isos, equal ; 

 p.fpos, meros, a part). The state 

 of compounds which contain the 

 same elements in the same propor- 

 tions, but have different proper- 

 ties. 



Isomorphism (Gr. Iffos, isos, equal ; 

 p.op<prt, morphe, form). The pro- 

 perty which certain substances 

 have of replacing each other in 

 crystallised compounds without 

 change of form. 



Isomor'phous (Gr. icros, isos, equal ; 

 fj.op<pT], morphe, form). Of equal 

 form ; applied to substances capa- 

 ble of replacing each other in crys- 

 talline compounds without altera- 

 tion of form. 



Isop'odous (Gr. l<ros, isos, equal, 

 irovs, pous, a foot). .Applied to an 

 order of crustaceans with fourteen 

 legs, not having the respiratory 

 organs attached to them. 



Isos'celes (Gr. tVos, isos, equal; ovceAos, 

 skel'os, a leg). Having two equal 

 legs, or sides. 



Isoste'monous (Gr. la-os, isos, equal ; 

 (TTTj^w, stemon, a stamen). In 

 botany, applied when the stamens 

 are equal in number to the sepals 

 or petals. 



Isoth'eral (Gr. lo-os, isos, equal ; 

 &pos, theros, summer). Having 

 the same mean summer temper- 

 ature. 



Isother'mal (Gr. Icros, isos, equal; 

 6fp/j.ci)S, thermos, hot). Having 

 equal heat : applied to lines drawn 

 round the globe, and passing over 

 points where the mean temperature 

 is equal. 



-Ite. A termination in chemistry, 

 denoting a salt formed of an acid 

 in a lower state of oxygenation. 



-Itis. A termination denoting in- 

 flammation. 



