mentioned, and in what manner the labour of the unproductive class does no more than replace the value of its own consumption, without increasing in any respect the value of that sum total, is represented by Mr Quesnai, the very ingenious and profound author of this system, in some arithmetical formularies. The first of these formularies, which, by way of eminence, he peculiarly distinguishes by the name of the Economical Table, represents the manner in which he supposes this distribution takes place, in a state of the most perfect liberty, and, therefore, of the highest prosperity; in a state where the annual produce is such as to afford the greatest possible neat produce, and where each class enjoys its proper share of the whole annual produce. Some subsequent formularies represent the manner in which he supposes this distribution is made in different states of restraint and regulation; in which, either the class of proprietors, or the barren and unproductive class, is more favoured than the class of cultivators; and in which either the one or the other encroaches, more or less, upon the share which ought properly to belong to this productive class. Every such encroachment, every violation of that natural distribution, which the most perfect liberty would establish, must, according to this system, necessarily degrade, more or less, from one year to another, the value and sum total of the annual produce, and must necessarily occasion a gradual declension in the real wealth and revenue of the society; a declension, of which the progress must be quicker or slower, according to the degree of this encroachment, according as that natural distribution, which the most perfect liberty would establish, is more or less violated. Those subsequent formularies represent the different degrees of declension which, according to this system, correspond to the different degrees in which this natural distribution of things is violated.
Some speculative physicians seem to have imagined that the health of the human body could be preserved only by a certain precise regimen of diet and exercise, of which every, the smallest violation, necessarily occasioned some degree of disease or disorder proportionate to the degree of the