Nothing is more usual and more natural for those who pretend to discover any thing new to the world in philosophy and the sciences, than to insinuate the praises of their own systems by decrying all those which have been advanced before them. And indeed were they content with lamenting that ignorance, which we still lie under in the most important questions that can come before the tribunal of human reason, there are few who have an acquaintance with the sciences that would not readily agree with them. 'Tis easy for one of judgment and learning to perceive the weak foundation even of those systems which have obtained the greatest credit, and have carried their pretensions highest to accurate and profound reasoning. Principles taken upon trust, consequences lamely deduced from them, want of coherence in the parts, and of evidence in the whole, these are every where to be met with in the systems of the most eminent philosophers, and seem to have drawn disgrace upon philosophy itself.