The main fact of the situation then is that the librarian's trust has of late years undergone stupendous increase; this at once broadens his opportunities and adds to his burdens. Gold and silver, iron and lead, together with much dross, are commingled in a heap which rises every hour. Before a trust can be rightly and gainfully administered, its trustees must know in detail what it is that they guard, what its several items are worth, what they are good for. And let us remember that literature consists in but small part of metals which declare themselves to all men as gold or lead; much commoner are alloys of every conceivable degree of worth or worthlessness. There is plainly nothing for it but to have recourse to the crucibles of the professional assayer, it becomes necessary to add to the titles of our catalogs some responsible word as to what books are and what rank they occupy in an order of just precedence. This task of a competent and candid appraisal of literature, as a necessity of its trusteeship, has been before the minds of this Association for a good many years. A notable Step toward its accomplishment was taken when Mr. Samuel S. Green, in 1879, allied himself with the teachers of Worcester, Massachusetts, that they and he together might select books for the public schools of that city. The work began and has proceeded upon comprehensive lines. Such literature has been chosen as may usefully and acceptably form part of the daily instruction, there is a liberal choice of books of entertainment and inspiration worthily to buttress and relieve the formal lessons. The whole work goes forward with intent to cultivate the taste, to widen the horizons, to elevate the impulses of the young reader. Mr. Green's methods, with the modifications needful in transplanting, have been adopted far and wide throughout the Union. Already they have borne fruit in heightening the standards of free choice when readers have passed from the school bench to the work-a-day world.