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IN'TEREST. In commerce, the allowance 

 made for the loan or forbearance of a 

 sum of money which is lent for, or be- 

 comes due, at a certain time. It is always 

 in regular transactions so much per cent., 

 and is either simple or compound. It is 

 simple when it arises upon the principal 

 only for the whole time of the loan, and 

 compound when the interestasit becomes 

 due remains unpaid and is perpetually ac- 

 cumulating, as stock bearing interest like 

 the original principal. In arithmetic, the 

 rule by which interest is computed. 



iKTEaFER'ENCE. In oplics, a term em- 

 ployed by Dr. Young to express certain 

 phenomena resulting from the mutual 

 action of the rays of light. 



IN'TERIM (Latin), in the mean time. 



INTERLOC'UTOR, Lat. interloquor. In 

 Scottish late, a judgment of a court on 

 some intermediate question, before the 

 linal judgment is passed. In literature, a 

 person who takes part in a dialogue. 



IN'TERLUDE, from inter and Indus, play. 

 An entertainment exhibited on the stage 

 between the acts of a play, or between 

 the play and the afterpiece, to amuse the 

 audience while the actors take* breath, 

 shift their dresses, &c. 



INTERLC'NARV, from inter and tana, the 

 moon. An epithet for the time when the 

 moon about its change is invisible ; called 

 interlunium by the old astronomers. 



INTERME'DE or INTERMEZZO. Nearly the 

 same as interlude. A short musical piece, 

 generally burlesque. 



INTERME'DIATE. In chemistry, a sub- 

 stance which is the intermedium or means 

 of chemical affinity, as an alkali, which 

 renders oil combinable with water. 



lNTERMODii/LioN,the space in architec- 

 ture between two modillions. 



iNTERNUN'ciOjfrom inter and nuncius, a 

 messenger. A messenger between parties. 



INTEROS'SEOUS MUSCLES, small muscles 

 between the bones of the hand and foot, 

 for moving the fingers and toes. 



INTERPILAS'TER. In architecture, the 

 space between two pilasters. 



INTERPLEADER. In law, a bill of inter- 

 pleader in chancery is where a person 

 owes a debt or rent to one of the parties 

 in suit, but till the determination of it he 

 knows not to which, and he desires that 

 they may interplead or settle their claims 

 between themselves, that he may be safe 

 in the payment. 



INTERPOLATION, from inter and polio. 

 Something put into the original matter. 

 The term is used in mathematical analy- 

 sis for the methods by which any inter- 

 mediate term in a series may be found, 

 its place from the first term being given. 



INTEHREG'NUM. Lat. from inter and >v<7- 

 num, reign. The time duiing which a 

 throne is vacant between the death or 

 Abdication of a sovereign and the acces- 



sion of his successor. In strintncss an 

 interregnum can only happen in govern- 

 ments where the sovereign is elective ; 

 for in hereditary kingdoms, the reign of 

 ihe successor commences at the moment 

 of his predecessor's death. The term has, 

 however, been used somewhat loosely. 



IN'TER-REX, a person appointed to dis- 

 charge the royal functions during a va- 

 cancy of the throne. 



INTERRUPTED, Lat. interrnptus, divided. 

 Applied to compound leaves when the 

 principt I leaflets are divided by intervals 

 of smaller ones ; also to spikes of flowers 

 where the larger spikes are divided by a 

 series of smaller ones. A stem is some- 

 times interrupted by the intervention of 

 leaves or smaller sets of flowers. 



lNTERscEN'DENT,Lat. inter andswrfo,l 

 climb. In algebra, quantities, the expo- 

 nents of whose powers are irrational. 

 They are a mean as it were between al- 

 gebraic and transcendental quantities, 

 whence the name. 



IN'TER-TIES, short pieces of timber used 

 in roofing, to bind upright posts together in 

 roof partitions, in lath and plaster work, 

 and in walls with timber frame- work. 



INTERTRANSVERSA'LES. In analcmy, four 

 small bundles of muscular fibres which 

 fill up the spaces between the transverse 

 processes of the vertebrae of the loins, 

 and serve to draw them towards each 

 other. 



IN'TERVAL, from inter and vallum, a 

 wall; a void space between two objects. 

 The term is technically applied in music 

 to the difference between the number of 

 vibrations produced by one sonorous body 

 of a certain texture and magnitude, and 

 of those produced by another of a differ- 

 ent texture and magnitude in the same 

 time. The ancients divided the intervals 

 into simple or uncomposite, which they 

 called diastems, and composite intervals, 

 which they called systems. Modern mu- 

 sicians consider the semitone as a simple 

 interval, and only call those composite 

 which consist of two or more semitones. 



INTERVER'TEBRAL, situated between the 

 vertebra?. Thus the intervertebral muscles 

 hold the vertebrae together. 



INTES'TINE, Lat. intestinus, from intus, 

 within. Internal. The intestines are the 

 convoluted canal or tube extending from 

 the right orifice of the stomach to the 

 anus. The whole length of this tube in 

 the human subject is about six times that 

 of the body. The small intestine com- 

 prises the upper four-fifths of the tube, 

 and the large intestine the remaining fifth. 

 The parts in their order downwards, are 

 the duodenum, the jejunum, the ileum. the 

 ccFcum, the colon, and the rectum. 



iNTONA'TioN.from in and tono, to sound. 

 A term in music for the action .of sound- 

 ing the notes of the scale with the voice, 



