INT 
I NT 
they are also chargeable in equity with pay- 
ment of interest for such sum. 
INTERJECTION, in grammar, an in- 
declinable part of speech, signifying some 
passion or emotion of the mind. As the 
greatest part of the expressions used on 
these occasions are taken from nature alone, 
the real interjections, in most languages, 
are monosyllables ; and as all nations agree 
in these natural passions, so do they agree 
in the signs and indications of them, as of 
love, mirth, &c. See Grammar. 
INTERLOCUTORY judgments, in law, 
are such as are given in the middle of a 
cause, upon some plea, proceeding, or de- 
fault, which is only intermediate, and does 
not finally determine or complete the suit. 
INTERLUDE, an entertainment ex- 
hibited on the theatre between the acts of 
a play, to amuse the spectators while the 
actors take breath and shift their dress, or 
to give time of changing, the scenes and de- 
corations. 
INTERMEDIATES, in chemistry, a 
term made use of when speaking of chemi- 
cal affinity. Oil, for example, has no af- 
finity to water unless jt be previously com- 
bined with an alkali, it then becomes soap, 
and the alkali is said to be the intermedium, 
which causes the union. 
INTERNAL, in general, signifies what- 
ever is within a thing. 
Euclid (lib. i. prop. 32) proves, that the 
sum of the three angles of every triangle is 
equal to two right angles ; whence he de- 
duces several useful corollaries. He like- 
wise deduces, from the same proposition, 
this theorem, viz. that the sum of the angles 
of every rectilinear figure is equal to twice 
as many right angles as the figure hath sides, 
excepting or subtracting four. 
INTERPOLATION, among critics, de- 
notes a spurious passage, inserted into the 
writings of some ancient author. One great 
rule with regard to the expunging interpo- 
lations, is, that the restitution be perfectly 
agreeable to the rest of the work. 
Interpolation, in algebra, is used for 
finding an intermediate term of a series, its 
place in the series being given. 
INTERROGATION, or point of In- 
terrogation, in grammar, a character of 
this form (?) serving to denote a question. 
Interrogation, in rhetoric, is a figure, 
whereby the orator proposes something by 
way of question ; which, it must be owned, 
greatly enlivens the discourse. 
INTERSECTION, in the mathematics, 
signifies the cutting of one line or plane by 
another. Thus, we say, that the mutual 
intersection of two planes is a right line. 
The centre of a circle, or conic section, &c. 
is in the intersection of two diameters ; and 
the central point of a quadrangle is the in- 
tersection of two diagonals. 
INTERVAL, in music, the difference 
between two sounds, in respect of acute 
and grave ; or that imaginary space termi- 
nated by tWo sounds, differing in acuteness 
or gravity. 
When two or more sounds are compared 
in this relation, they are either equal or un- 
equal in the degree of time : such as are 
equal are called unisons, with regard to 
each other, as having one tune ; the other, 
being at a distance from each other, con- 
stitute what we call an interval in music ; 
which is properly the distance in time be- 
tween two sounds. Intervals are distin- 
guished into simple and compound. A sim- 
ple interval is without parts or divisions. 
Such are the octave, and all that are within 
it; as the second, third, fourth, fifth, sixth, 
and seventh, with their varieties. A com- 
pound interval consists of several lesser in- 
tervals ; such are all those greater than the 
octave, as the ninth, tenth, eleventh, twelfth, 
&c. with their varieties. 
INTESTINA, in natural history, the 
first of the five orders of the class Vermes, 
in the Linnasan system. This order is de- 
scribed as of a formation the most simple, 
being naked animals without limbs. They 
live, som^-of them within other animals, 
some in waters, and a few in the earth. 
They are distinguished from the Mollus.ca, 
by the want of moveable appendages, or 
tentacula. There are two divisions. 
A, found within other animals, without 
eyes, of which there are fifteen genera, 
viz. 
Ascai'is 
Caryophyllams 
Cucullanus 
Echynorhynchus 
Fasciola 
Filaria 
Furia 
Ligula 
Linguatela 
Scolex 
Strongylus 
Ttenia 
Trieocephalus 
Uncinarise. 
Heeruca 
B, not inhabiting the bodies of other 
animals, these are some with and some 
without a lateral pore, and others perfo- 
rated with a lateral pore. Of these there 
are five species, viz , 
Gordius Planaria 
Hirndo Sipunculus, 
Ltiimbricus 
