COTTON MATHER was undoubtedly the most prominent Author who wrote on Witchcraft, and in the full Belief of it, in his Time, in this Country; this Circumstance accounts for his being singled out by "one _Robert Calef_," who attacked him with some Success, even then, in his Book which he called _More Wonders of the Invisible World_, &c., which he published in London, in a quarto Volume, in the Year 1700. In his Book, Calef styles himself "Merchant, of _Boston_ in _New England_." Now in the Absence of Proof to the contrary, it may not be unfair to presume, that Calef issued his Work quite as soon as he dared to, and quite as soon as public Opinion would tolerate a Work which had for its Aim a deadly Blow against a Belief in the imaginary Crime of Witchcraft. For we know that as soon as Calef's Book did appear, some of Dr. Mather's Friends came out with another Work against that Author, from the Title of which alone its Contents can pretty well be judged of. It is _Some few Remarks upon a Scandalous Book written by one Robert Calef_. But this Book and its Authors are alike almost unknown, while Calef occupies a conspicuous Place among the Benefactors of Mankind. The foreign Correspondence of Dr. Mather was very extensive; "so that," says his Son, "I have known him at one Time to have above _fifty_ beyond Sea." Among his Correspondents were many of the most learned and famous Men in Europe; as SIR RICHARD BLACKMORE, MR. WHISTON, DR. DESAGULIERS, MR. PILLIONERE, DR. FRANCKIUS, WM. WALLER, DR. CHAMBERLAIN, DR. WOODWARD, DR. JURIN, DR. WATTS, &c., &c. In a Letter which he wrote in 1743 Dr. Watts says, "he had enjoyed a happy Correspondence with Dr. Cotton Mather, for nearly twenty Years before his Death, as well as with the Rev. Mr. Samuel Mather, his Son, ever since."