suffocating Exhalations, Hurricanes, and Spouts; we may
learn that sulphureous Steams abound in the Bowels of the Earth and
ferment with Minerals, and sometimes take fire with a sudden Coruscation
and Explosion; and if pent up in subterraneous Caverns, burst the
Caverns with a great shaking of the Earth, as in springing of a Mine.
And then the Vapour generated by the Explosion, expiring through the
Pores of the Earth, feels hot and suffocates, and makes Tempests and
Hurricanes, and sometimes causes the Land to slide, or the Sea to boil,
and carries up the Water thereof in Drops, which by their weight fall
down again in Spouts. Also some sulphureous Steams, at all times when
the Earth is dry, ascending into the Air, ferment there with nitrous
Acids, and sometimes taking fire cause Lightning and Thunder, and fiery
Meteors. For the Air abounds with acid Vapours fit to promote
Fermentations, as appears by the rusting of Iron and Copper in it, the
kindling of Fire by blowing, and the beating of the Heart by means of
Respiration. Now the above-mention'd Motions are so great and violent as
to shew that in Fermentations the Particles of Bodies which almost rest,
are put into new Motions by a very potent Principle, which acts upon
them only when they approach one another, and causes them to meet and
clash with great violence, and grow hot with the motion, and dash one
another into pieces, and vanish into Air, and Vapour, and Flame.

When Salt of Tartar _per deliquium_, being poured into the Solution of
any Metal, precipitates the Metal and makes it fall down to the bottom
of the Liquor in the form of Mud: Does not this argue that the acid
Particles are attracted more strongly by the Salt of Tartar than by the
Metal, and by the stronger Attraction go from the Metal to the Salt of
Tartar? And so when a Solution of Iron in _Aqua fortis_ dissolves the
_Lapis Calaminaris_, and lets go the Iron, or a Solution of Copper
dissolves Iron immersed in it and lets go the Copper, or a Solution of
Silver dissolves Copper and lets go the Silver, or a Solution of Mercury
in _Aqua fortis_ being poured upon Iron, Copper, Tin, or Lead, dissolves
the Metal and lets go the Mercury; does not this argue that the acid
Particles of the _Aqua fortis_ are attracted more strongly by the _Lapis
Calaminaris_ than by Iron, and more strongly by Iron than by Copper, and
more strongly by Copper than by Silver, and more strongly by Iron,
Copper, Tin, and Lead, tha