adverb.

_Imaginary Line_. The adjective is needless. Geometrically, every line
is imaginary; its graphic representation is a mark. True the
text-books say, draw a line, but in a mathematical sense the line
already exists; the drawing only makes its course visible.

_In_ for _Into_. "He was put in jail." "He went in the house." A man
may be in jail, or be in a house, but when the act of entrance--the
movement of something from the outside to the inside of another
thing--is related the correct word is into if the latter thing is
named.

_Inaugurate_ for _Begin_, _Establish_, etc. Inauguration implies some
degree of formality and ceremony.

_Incumbent_ for _Obligatory_. "It was incumbent upon me to relieve
him." Infelicitous and work-worn. Say, It was my duty, or, if enamored
of that particular metaphor, It lay upon me.

_Individual_. As a noun, this word means something that cannot be
considered as divided, a unit. But it is incorrect to call a man,
woman or child an individual, except with reference to mankind, to
society or to a class of persons. It will not do to say, "An
individual stood in the street," when no mention nor allusion has been
made, nor is going to be made, to some aggregate of individuals
considered as a whole.

_Indorse_. See _Endorse_.