When it is something that he has for sale there are cross-references to likely purchasers of that particular line of article.

I don't limit myself to things that I actually know people to be in want of, I go further than that and have theories, carefully indexed theories, as to the things that people might want to buy.

At the right moment, if I can get the opportunity, I mention the article that is in my mind's eye to the possible purchaser who has also been in my mind's eye, and I frequently bring off a sale.

I started a chance acquaintance on a career of print-buying the other day merely by telling him of a couple of good prints that I knew of, that were to be had at a quite reasonable price; he is a man with more money than he knows what to do with, and he has laid out quite a lot on old prints since his first purchase.

Most of his collection he has got through me, and of course I net a commission on each transaction.