The distinction then between these two sorts of indolence is, that in the latter our ideas are perfectly distinct, are attended with consciousness, and can, as we please, be called up to recollection. This therefore is not what we understand by reverie. In these waking hours which are spent by us in bed, the mind is no less busy, than it is in sleep during a dream. The other and more perfect sort of mental indolence, is that which we often experience during our exercise in the open air. This is of the same nature as the condition of thought which seems to be the necessary precursor of sleep, and is attended with no precise consciousness. By the whole of the above statement we are led to a new and a modified estimate of the duration of human life. If by life we understand mere susceptibility, a state of existence in which we are accessible at any moment to the onset of sensation, for example, of pain--in this sense our life is commensurate, or nearly commensurate, to the entire period, from the quickening of the child in the womb, to the minute at which sense deserts the dying man, and his body becomes an inanimate mass. But life, in the emphatical sense, and par excellence, is reduced to much narrower limits. From this species of life it is unavoidable that we should strike off the whole of the interval that is spent in sleep; and thus, as a general rule, the natural day of twenty-four hours is immediately reduced to sixteen. Of these sixteen hours again, there is a portion that falls under the direction of will and attention, and a portion that is passed by us in a state of mental indolence. By the ordinary and least cultivated class of mankind, the husbandman, the manufacturer, the soldier, the sailor, and the main body of the female sex, much the greater part of every day is resigned to a state of mental indolence. The will does not actively interfere, and the attention is not roused. Even the most intellectual beings of our species pass no inconsiderable portion of every day in a similar condition. Such is our state for the most part during the time that is given to bodily exercise, and during the time in which we read books of amusement merely, or are employed in witnessing public shews and exhibitions. That portion of every day of our existence which is occupied by us with a mind attentive and on the alert, I would call life in a transcendant sense. The rest is scarcely better than a state of vegetation.