Let us now consider for a few moments some features of resemblance and diversity between the library profession and others quite as well or better known. It has been said that the library exists chiefly for the use of its patrons, and that the librarian is necessarily and essentially a servant. Therefore the librarian must, of equal necessity, earn a livelihood or receive compensation of some kind for his services. All of which, in the main, is true of the professions generally, as will be seen from a brief statement of circumstances. Doctors, lawyers, accountants, engineers, artists, etc., are engaged by and receive pay from their respective clients. The clergy are supported by contributions of their church members or from denominational resources. Teachers in the public schools are paid from public taxes, while those of private schools, or endowed institutions, receive their compensation from various sources. The clergy and teachers, as a rule, like most librarians, no matter how willing or how well qualified, are under the further necessity of obtaining a "call," or position, as a prerequisite to the exercise of their professional faculties. In that respect they are at a disadvantage in comparison with those practitioners in the other professions, already named, who can go to any locality, solicit clients and seek business opportunities, with reasonable assurance of obtaining both according to place and the circumstances of supply and demand. In some of the professions, both the so-called "learned" and the practical ones, there have been developed certain well recognized differentiations and specializations of professional work. Those lines have usually been taken up in response to what has seemed a reasonable demand for them; and in their exercise have not unfrequently brought both reputation and corresponding remuneration to the specialists. Possibly the time has arrived for doing much more of that nature in the library profession than has yet been customary. And there are those among us, possessing a due amount of working experience coupled with knowledge of other and allied affairs, who might now do well to devote themselves to some special features of library enterprise as a matter of desirable business opportunity. Some from the library schools, and a few others, have gone out as "organizers," and found more or less of a field for the exercise of their limited special qualifications. The field ought to be a growing one, it would seem, if recourse to incompetent aid is carefully avoided.