Identified with. "He is closely identified with the temperance movement." Say, connected.
Ilk for Kind. "Men of that ilk." This Scotch word has a narrowly limited and specific meaning. It relates to an ancestral estate having the same name as the person spoken of. Macdonald of that ilk means, Macdonald of Macdonald. The phrase quoted above is without meaning.
Illy for Ill. There is no such word as illy, for ill itself is an 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.
Insane Asylum. Obviously an asylum cannot be unsound in mind. Say, asylum for the insane.