part of the heavens, a comet will appear; the con∣clusion from experience would not be as millions, but as infinite to one, that the proposition is false. In∣stead of this, suppose you have the testimony of but one ocular witness, a man of integrity, and skilled in astronomy, that at such an hour, of such a day, in such a part of the heavens, a comet did appear; you will not hesitate one moment to give him credit. Yet all the presumption that was against the truth of the first supposition, tho' almost as strong evidence as experience can afford, was also against the truth of the second, before it was thus attested.
It is necessary to urge further, in support of this doctrine, that as the water in the canal cannot be made to rise higher than the fountain whence it flows; so it is impossible, that the evidence of testimony, if it proceeded from experience, should ever exceed that of experience, which is its source? Yet that it greatly exceeds this evidence, appears not only from what hath been observed already, but still more, from what I shall have occasion to observe in the sequel. One may safely affirm, that no conceivable conclusion from experience, can possess stronger evidence, than that which ascertains us of the regular succession and duration of day and night. The reason is, the instances on which this experience is founded, are both with∣out number and without exception. Yet even this conclusion, the author admits, as we shall see in the third section, may, in a particular instance, not only be surmounted, but even annihilated by testimony.
Lastly, let it be observed, that the immediate con∣clusion from experience is always general, and runs thus: 'This is the ordinary course of nature.'