In the _eight_: First, of _Stones_, their Origine, Concretion, difference of Colours; and in particular, of _Gems_ and their variety, causes of generation, transparency in some and colours in others; as also of their various Figures and Pictures by Nature framed both in common and precious Stones, with their Causes. Secondly, of the Transformation of Juices, Salts, Plants, yea of Beasts and Men turn'd into Stone: together with the generation of Bony Substances under ground, by many esteemed to be the Bones of _Gyants_; and of _Horny_ Substances, taken for _Unicorns_ horns: as also of _Fossile wood_ and _Coals_, Thirdly, of _Bituminous Flowers, lapis Asbestos, Amber_, and its _Electrical_ virtue; together with the way how Insects, little Fishes, and Plants are Intombed therein. Fourthly; of Subterraneous _Animals_, Moles, Mice, Birds, Dragons; where is also treated, of those Animals that are found in the midst of Stones. In the _ninth_; First, of Poysons, their primeval Origine from Minerals, and their accidental Generation in Vegetable and Animal Bodies, together with their differences; where 'tis discoursed, not only how Poysons may be bred in Men, but also, how the Poyfons of some Animals do infect and kill Men; and, where the Venom of Vipers lodges, and how mad _Dogs_ and _Tarantula's_ so communicate their Poyson, as that it exserts not its noxiousness, till after some {112} time: Where also occasion is taken to discourse on the Original of Diseases, and cure of Poysonous ones. Secondly, of the wonderful Nature of _Sulphur, Antimony, Quick-silver_, their origine and qualities; together with the productions of _Corals_ and _Pearls_. In the _tenth_: First of _Metallurgy_, and the way how that unctuous Body, out of which mettals are produced, is elaborated by Nature, and what therein are _Sulphur, Salt_, and _Mercury_; besides, what it is that renders Mettals fluid in the Fire, but not Stones and Vegetables, &c. Secondly, of the Requisits to a perfect knowledge of the _Metallick Art_, and of the Qualities of the _Mine-master_; then of the Diseases of Mine-men, and their Cure, and the waies of purging the Mines of the Airs malignity; as also of _Metallognomy_, or the signs of latent Mettals, and by what Art they may be discovered. Thirdly, several Accounts sent to the Author, upon his Inquiries by the Mine-masters themselves, or other cheif Over-seers of the Mine-works, touching the variety, nature and properties of Minerals, and the many Accidents happening in Mines, particularly the _Hungarian_ ones at _Schemnitz_, and those of _Tyrol_. Fourthly, of several both _Hydraulick_ and _Wind-Engines_, to free the Mines from Water and noxious damps. Fiftly, Of the way of working Mettals, Gold, Silver, Copper, Iron, and particularly of the method used at _Potosi_ in _Peru_, of extracting the Silver out of the Mineral: to which is added, a Discourse of _Salt-pits_, and the way of making Salt.