'Who don't you know ?' 'The simplest thing in the world.

At present it's a large part of my business to make acquaintances.

Why, look you; a man who has to live by miscellaneous writing couldn't get on without a vast variety of acquaintances.

One's own brain would soon run dry; a clever fellow knows how to use the brains of other people.' Amy listened with an unconscious smile which expressed keen interest.
'Oh,' pursued Jasper, 'when did you see Whelpdale last ?' 'Haven't seen him for a long time.' 'You don't know what he's doing?
The fellow has set up as a "literary adviser." He has an advertisement in The Study every week.

"To Young Authors and Literary Aspirants"-- something of the kind.