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so happily supplies the defects of language, and enables the eye to conceive what cannot be conveyed to the mind any other way. When they have read this treatise, and practised upon these figures, their theory may be improved by the Jesuit's Perspective, and their manual operations by other figures which may be easily procured.

VII. Logick, or the art of arranging and connecting ideas, of forming and examining arguments, is universally allowed to be an attainment in the utmost degree worthy the ambition of that being whose highest honour is to be endued with reason ; but it is doubted whether that ambition has yet been gratified, and whether the powers of ratiocination have been much improved by any systems of art, or methodical institutions. The logick which for so many ages kept possession of the schools, has at last been condemned as a mere art of wrangling, of very little use in the pursuit of truth; and later writers have contented themselves with giving an account of the operations of the mind, marking the various stages of her progress, and giving some general rules for the regulation of her conduct. The method of these writers is here followed; but without a servile adherence to any, and with endeavours to make improvements upon all. This work, however laborious, has yet been fruitless, if there be truth in an observation very frequently made, that logicians out of the school do not reason better than men unassisted by those lights which their science is supposed to bestow. It is not to be doubted but that logicians may be sometimes overborne by their passions, or blinded by their prejudices; and that a man may reason ill,

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as he may act ill, not because he does not know what is right, but because he does not regard it; yet it is no more the fault of his art that it does not direct him when his attention is withdrawn from it, than it is the defect of his sight that he misses his way when he shuts his eyes. Against this cause of error there is no provision to be made, otherwise than by inculcating the value of truth, and the necessity of conquering the passions. But logick may likewise fail to produce its effects upon common occasions, for want of being frequently and familiarly applied, till its precepts may direct the mind imperceptibly, as the fingers of a musician are regulated by his knowledge of the tune. This readiness of recollection is only to be procured by frequent impression; and therefore it will be proper, when logick has been once learned, the teacher take frequent occasion, in the most easy and familiar conversation, to observe when its rules are preserved, and when they are broken; and that afterwards he read no authors, without exacting of his pupil an account of every remarkable exemplification or breach of the laws of reasoning.

When this system has been digested, if it be thought necessary to proceed farther in the study of method, it will be proper to recommend Crousaz, Watts, Le Clerc, Wolfius, and Locke's Essay on Human Understanding; and if there be imagined any necessity of adding the peripatetick logick, which has been perhaps condemned without a candid trial, it will be convenient to proceed to Sanderson, Wallis, Crackanthorp, and Aristotle.

VIII. To excite a curiosity after the works of God, is the chief design of the small specimen of notural history inserted in this collection ; which, however, may be sufficient to put the mind in mo tion, and in some measure to direct its steps; but its effects may easily be improved by a philosophick master, who will every day find a thousand opportunities of turning the attention of his scholars to the contemplation of the objects that surround them, of laying open the wonderful art with which every part of the universe is formed, and the providence which governs the vegetable and animal creation. He may lay before them the Religious Philosopher, Ray, Derham's Physico-Theology, together with the Spectacle de la Nature; and in time recommend to their perusal Rondoletius and Aldrovandus.

IX. But how much soever the reason may be strengthened by logick, or the conceptions of the mind enlarged by the study of nature, it is necessary the man be not suffered to dwell upon them so long as to neglect the study of himself, the knowledge of his own station in the ranks of being, and his various relations to the innumerable multitudes which surround him, and with which his Maker has ordained him to be united for the reception and communication of happiness. To consider these aright is of the greatest importance, since from these arise duties which he cannot neglect. Ethicks, or morality, therefore, is one of the studies which ought to begin with the first glimpse of reason, and only end with life itself. Other acquisitions are merely temporary benefits, except as they contribute to illustrate the knowledge, and confirm the practice of morality and piety, which extend their influence beyond the grave,

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and increase our happiness through endless duration.

This great science, therefore, must be inculcated with care and assiduity, such as its importance ought to incite in reasonable minds; and for the prosecution of this design, fit opportunities are always at hand. As the importance of logick is to be shewn by detecting false arguments, the excellence of morality is to be displayed by proving the deformity, the reproach, and the misery of all deviations from it. Yet it is to be remembered, that the laws of mere morality are no coercive power ; and, however they may by conviction of their fitness please the reasoner in the shade, when the passions stagnate without impulse, and the appetites are secluded from their objects, they will be of little force against the ardour of desire, or the vehemence of rage, amidst the pleasures and tumults of the world. To counteract the power of temptations, hope must be excited by the prospect of rewards and fear by the expectation of punishment; and virtue may owe her panegyricks to morality, but must derive her authority from religion.

When therefore the obligations of morality are taught, let the sanctions of christianity never be forgotten; by which it will be shewn, that they give strength and lustre to each other ; religion will appear to be the voice of reason, and morality the will of God. Under this article must be recommended Tully's Offices, Grotius, Puffendorf, Cumberland's Laws of Nature, and the excellent Mr. Addison's Moral and Religious Essays.

X. Thus far the work is composed for the use of scholars, merely as they are men. But it was thought necessary to introduce something that might be particularly adapted to that country for which it is designed ; and therefore a discourse has been added upon trade and commerce, of which it becomes every man of this nation to understand at least the general principles, as it is impossible that any should be high or low enough not to be in some degree affected by their declension or prosperity. It is therefore necessary that it should be universally known among us, what changes of property are advantageous, or when the balance of trade is on our side: what are the products or manufactures of other countries; and how far one nation may in any species of traffick obtain or preserve superiority over another. The theory of trade is yet but little understood, and therefore the practice is often without real advantage to the publick; but it might be carried on with more general success, if its principles were better considered ; and to excite that attention is our chief design. To the perusal of this book may succeed that of Mun upon foreign Trade, Sir Josiah Child, Locke upon Coin, Davenant's treatises, the British Merchant, Dictionnaire de Commerce, and, for an abstract or compendium, Gee, and an improvement that may hereafter be made upon his plan.

XI. The principles of laws and government come next to be considered ; by which men are taught to whom obedience is due, for what it is paid, and in what degree it may be justly required. This knowledge, by peculiar necessity, constitutes a part of

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