One leading cause for the mistakes which are so patent in our library buildings is that they are not planned by librarians but mainly by architects. The library authorities commonly take it for granted that the able architect is master of his profession, and entrust him with the whole design, leaving out of account the librarian, as a mere subordinate, entitled only to secondary consideration. The result is a plan which exhibits, in its prominent features, the architect's skill in effective pilasters, pillars, architraves, cornices, and balustrades, while the library apartments which these features ornament are planned, not for convenient and rapid book-service, but mainly for show. It is the interest of architects to magnify their profession: and as none of them has ever been, or ever will be a librarian, they cannot be expected to carry into effect unaided, what they have never learned; namely, the interior arrangements which will best meet the utilities of the library service. Here is where the librarian's practical experience, or his observation of the successes or failures in the reading-room and delivery service of other libraries, should imperatively be called in. Let him demonstrate to the governing board that he knows what is needed for prompt and economical administration, and they will heed his judgment, if they are reasonable men. While it belongs to the architect to plan, according to his own ideas, the outside of the building, the inside should be planned by the architect in direct concert with the librarian, in all save merely ornamental or finishing work. We do not erect a building and then determine whether it is to be a school house or a church: it is planned from the start with strict reference to the utilities involved; and so should it always be with a library.