The causes of the pleasant emotions hitherto in view, are either an individual, such as a companion, a certain dwelling-place, certain amusements, _&c._; or a particular species, such as coffee, mutton, or any particular food. But habit is not confined to these. A constant train of trifling diversions, may form such a habit in the mind, as that it cannot be easy a moment without amusement. Variety in the objects prevents a habit as to any one in particular; but as the train is uniform with respect to amusement in general, the habit is formed accordingly; and this sort of habit may be denominated _a generic habit_, in opposition to the former, which may be called _a specific habit_. A habit of a town-life, of country-sports, of solitude, of reading, or of business, where sufficiently varied, are instances of generic habits. It ought to be remarked, that every specific habit hath a mixture of the generic. The habit of one particular sort of food, makes the taste agreeable; and we are fond of this taste where-ever found. A man deprived of an habitual object, takes up with what most resembles it: deprived of tobacco, any bitter herb will do, rather than want. The habit of drinking punch, makes wine a good resource. A man accustomed to the sweet society and comforts of matrimony, being unhappily deprived of his beloved object, inclines the sooner to a second choice. In general, the quality which the most affects us in an habitual object, produceth, when we are deprived of it, a strong appetite for that quality in any other object.