entleman and artist, to shopkeepers, cobblers, cooks, and
tailors, who find in the large commissions gained a temptation to
forsake their petty legitimate callings for the lottery-like excitements
and _finesse_ of picture-dealing. No sooner has the stranger gone to his
hotel than a watch is put upon his movements, and bribery and cajolery
used to get access to him. It is the _sensale's_ business to discover
and offer pictures. He is supposed to know the locality of every one,
good or bad, in his neighborhood. However jealous of each other, all
are loyally pledged together to take in the stranger. Leagued with the
dealer, artist, owner, courier, or servant, with any one, in fact, that
by any possibility can stand between the buyer and his object, it has
become almost an impossibility, especially for transient visitors, to
purchase anything whatever without paying a heavy toll to intermediates.
When the conspiracy is widely extended, the augmentation of price above
what would be required in direct dealing with the owner is sometimes
double or even quadruple. Occasionally, however, by way of compensation
for their general evil, the _sensali,_ having scented a prize, offer it
first to the amateur, in view of their own increase of gain over what
the dealer would allow. In this way, good pictures not unfrequently
escape the merchant, and reach the collector at a lower price than if
they had gone directly to the former.

The _sensali_ are not without their use in another respect. So indirect
and underhand is the Italian's mode of dealing in these matters, and
so eccentric his notions as to value, that a foreigner is apt to be
speedily disgusted or driven away by the magnitude of demands which in
reality the seller never expects to realize. Hence the negotiation is
best done through an agent, the buyer having fixed his price, leaving
the _sensale_ to make what he can for himself. No purchaser, however,
should give heed to any statement about the history or authenticity of
the works offered to him through such channels, but rely both for value
and facts upon his own resources; otherwise he will be deceived to an
extent that would appear almost fabulous to the uninitiated.

Such are the preliminary difficulties that beset the amateur. We will
suppose him in connection with the seller, and trace his progress.
First, the quality of his judgment and the impressibility of his
imagination are tested by a series of experiments as delic