GLOSSARY. 



tone). The manner of sounding the 

 notes of a musical scale. 



Intracellular (Lat. intra, within ; 

 cell'ula, a cell). Within cells ; ap- 

 plied in histology to the formation 

 of cells within cells. 



Intralob'ular (Lat. intra, within ; 

 lo'bulus, a lobule). Within lobules 

 or little lobes. 



Intran'sitive (Lat. in, not ; trans, 

 over ; co, I go). Not passing on : 

 applied to verbs in which the action 

 does not pass to or act on an object. 



Intrau'terine (Lat. intra, within ; 

 u'terus, the womb). Within the 

 uterus or womb. 



In'trorse (Lat. intror'sum, within). 

 Turned inwards ; in botany, applied 

 to anthers which open on the side 

 next the pistil. 



Intuition (Lat. in, on ; tu'cor, I look). 

 The process by which the mind 

 perceives a fact at once, without 

 the intervention of other ideas, or 

 of reasoning. 



Intuitive (Lat. in, on ; tu'eor, I look). 

 Perceived immediately by the mind, 

 without a process of reasoning. 



Intumes'cence (Lat. in, in; tu'meo, 

 I swell). A swelling. 



Intussusception (Lat. intus, within ; 

 suscip'io, I take up). A drawing 

 of one part of a tube or canal into 

 another. 



Inven'tion (Lat. inven'io, I find). A 

 finding ; the production of some 

 combination or contrivance that 

 did not before exist. 



Inverse (Lat. in; vcrto, I turn). 

 Placed in a contrary order ; as in 

 an arithmetical proportion, when 

 the ratio of the numbers to each 

 other appears to be reversed. 



Inversion (Lat. in; verto, I turn). 

 A placing in a contrary order ; a 

 mutual changing of position. 



Invertebrate (Lat. in, not ; vertebra, 

 a bone of the spine). Without ver- 

 tebrae or spinal bones. 



Involu'cel (Involufcrum ; eel, de- 

 noting smallness). In botany, the 

 collection of bractlets which sur- 

 rounds a secondary or partial umbel. 



Involu'crum (Lat. in, in ; volvo, I 

 roll). A covering membrane : in 



botany, a collection of bracts round 

 a cluster of flowers : the layer of 

 epidermis covering in the spore- 

 cases on ferns. 



Invol'untary (Lat. in, not ; volun'tas, 

 will). Not dependent on or pro- 

 ceeding from the will. 



In'volute (Lat. in, in ; volvo, I roll). 

 Rolled inwards ; in botany, applied 

 to a leaf which has each of its 

 edges rolled inwards towards the 

 midrib. 



Involution (Lat. in, into ; volvo, I 

 roll). A folding or rolling in ; in 

 arithmetic and algebra, the raising 

 a number from its root to a power, 

 as if it were folded or rolled on 

 itself. 



I'odate (I'odine). A compound of 

 iodic acid with a base. 



lod'ic (I'odine). Containing iodine. 



I'odide (I'odine). A compound of 

 iodine with a metal or other sub- 

 stance. 



I'odine (Gr. lov, i'on, a violet). A 

 solid elementary body, the vapour 

 of which has a violet colour. 



I'odism (I'odine). In medicine, a 

 morbid condition sometimes pro- 

 duced by the use of iodine. 



Ton (Gr. lo>v, ion, going). A name 

 applied to the elements of sub- 

 stances capable of decomposition by 

 the voltaic current, and which are 

 evolved at the poles of the battery. 



Iris (Gr. Ipis, iris, the rainbow). 

 The ring-shaped diaphragm which 

 surrounds the pupil of the eye ; so 

 called from being coloured. 



Irides'cence (Gr. Ipis, iris, the rain- 

 bow). A play of colours like a 

 rainbow. 



Irides'cent (Gr. Ipis, iris, the rain- 

 bow). Marked with colours like 

 the rainbow. 



Ironstone. A terra for the car- 

 bonates of iron found in nodules or 

 thin layers in secondary rocks. 



Irra'diation (Lat. in; ra'dius, a 

 ray). Emission of light ; illumi- 

 nation. 



Ir'rigate (Lat. in, on ; ri'go, I mois- 

 ten). To moisten. 



Irritability (Lat. irrito, I excite). 

 Excitability : the property of 



