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 In this Collection of their Discourses, and Treatises, my Reader beholding so many to pass under the name of Hypotheses, may perhaps imagine that this consists not so well with their Method, and with the main purpose of their Studies, which I have often repeated to be chiefly bent upon the Operative, rather than the Theoretical Philosophy. But I hope he will be satisfied, if he shall remember, that I have already remov'd this doubt, by affirming that whatever Principles, and Speculations they now raise from things, they do not rely upon them as the absolute end, but only use them as a means of farther Knowledge. This way the most speculative Notions, and Theorems that can be drawn from matter, may conduce to much profit. The light of Science, and Doctrines of causes, may serve exceeding well to promote our Experimenting; but they would rather obscure, than illuminate the Mind, if we should only make them the perpetual Objects of our Contemplation: as we see the light of the Sun, is most beneficial to direct our footsteps in walking, and our hands in working, which would certainly make us blind, if we should only continue fix'd, and gazing on its Beams.

The Histories they have gather'd, are either of Nature, Arts, or Works. These they have begun to collect by the plainest Method, and from the plainest Information. They have fetch'd their Intelligence from the constant and unerring use of experienc'd Men of the most unaffected, and most unartificial kinds of life. They have already perform'd much in this way, and more they can promise the world to accomplish in a very short space of time.

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