It is here that the trustee, as the official representative of the general public, may apply a corrective influence. In the case of the artist or the writer this influence is brought to bear generally in a financial way--by a wealthy patron who will order a picture or statue provided it accords with his own ideas--by hostile criticism, public or private, that drives away purchasers. In a public library, public opinion rarely makes itself felt in this way; indeed, it could do so only in cases where disregard of the public amounted to mismanagement and led to the reduction of appropriations or the discharge of the librarian. Public criticism, as in the press, might also affect a librarian’s course; it undoubtedly often does, but it need not; and he may safely disregard it as a general thing. When, however, his board of trustees calls him to account, he must listen, and when it tells him what he is expected to do, it is then his business to devise the best way to do it. A rough classification and analysis of the results that a librarian may be expected to accomplish may not be out of place here. We may treat them under four heads: financial, educational, recreational and social. _Financial results._--A library must show a good material return for money expended. By this is meant that its books and supplies must be purchased at fair rates, its salaries reasonably proportioned to quantity and quality of services rendered, its property economically administered. A board of trustees is derelict in its duty if it does not require all this, and also hold its librarian rigidly to such requirement. This means that it must, along the broadest lines, know the ratio of expenditure to return in these various departments; it does not mean that the librarian should be hampered by the prescription of details. It means, for example, that the expert administrator should be called to account if his bills for lighting and heating are excessive, and that he should be asked to show cause why they should not be kept within bounds; it does not mean that he should be required to use lights of a certain candle-power or turn off the light in a particular room at a given hour. In most libraries, the making of annual appropriations under designated heads and the requirement that cause shall be shown for a transfer from one of these categories to another, are sufficient measures of financial control.