This class of books requires less time, less study, and less money, and rewards the authors pecuniarily better than any other kind of work, considering, of course, the comparatively small amount of application required. As the females of our land become more generally educated, and have more leisure for the cultivation of their minds, no doubt more attention will be devoted to literary effort. The easy, natural manner of female authors is a marked feature. Different motives prompt to authorship--love of fame, wealth, influence, and a desire to do good. Persons are generally prompted to write by feeling that they know more of some particular subject than most people, or something entirely unknown or unthought of by any one save themselves. Some collect and arrange information obtained from books, observation, or experience, or all combined. E. Hazen says: "The indispensable qualifications to make a writer are--a talent for literary composition, an accurate knowledge of language, and an acquaintance with the subject to be treated." Good health and freedom from care are necessary for one who would give him or herself up to the severities of mental labor. Dr. Wynne says: "With him whose occupation is either intellectual or sedentary, or both, the nervous energy necessary to digest food is already abstracted by the operations of the mind; and the meal taken under the circumstances is but partially digested and appropriated to the use of the body. The remainder acts as an irritant, and, if the practice be persevered in, terminates in dyspepsia, followed by that Protean train of nervous diseases which destroys the equanimity of mind, and finally terminates the life of so many of our most efficient and worthy business men, at the very time when their services are most valuable to their families and the community. The cares of business should be dismissed with the termination of the hours devoted to their pursuits, and their place supplied by those exercises or amusements which bring with them cheerfulness and exhilaration." Of all studies, the quiet and contemplative kind are most favorable to long life. Those of an exciting nature produce a reaction, sometimes, of the physical as well as intellectual powers.