So you and Augustus have been quarrelling about Mountjoy ?" "Not that I know of." "He says so; and I believe his word on such a subject sooner than yours.
You are likely to quarrel without knowing it, and he is not.

He thinks that you know what has become of Mountjoy." "Does he?
Why should he think so, when I told him that I know nothing?
I tell you that I know absolutely nothing.

I am ignorant whether he is dead or alive." "He is not dead," said the father.
"I suppose not; but I know nothing about him.

Why your second son--" "You mean my eldest according to law,--or rather my only son!" "Why Augustus Scarborough," continued Harry Annesley, "should take upon himself to suspect that I know aught of his brother I cannot say.

He has some cock-and-bull story about a policeman whom he professes to believe to be ignorant of his own business.