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Rh Relations. And some of these Impediments do yet suppress what the Author intended should have made a part of the Book, which now he suffers to be publish'd without them, though divers of his Papers about some other particular Qualities have been written so long ago, as to have lain for many years neglected among other of his old Writings: Which that he may have both leasure and health to review, and fit for publication, is the ardent wish of the sincere Lovers of Real Knowledge, who have reason to look on it as no mean proof of his constant kindness to Experimental Philosophy, that in these Tracts he perseveres in his course of freely and candidly communicating his Experiments and Observations to the publick, notwithstanding the liberty that hath been too boldly taken to mention them as their own by some later Writers; as particularly by the Compiler of the Treatise, entitul'd Polygraphice, who in two Chapters hath allow'd himself to present his Reader with above Fifty Experiments, taken out of