5 § Salt whence derived, and how dijfufed , 
We begin our Experiments with that 
native fofiile Salt, ufually called Rock-Salt 
from its Place of Growth, and from its 
Clearnefs Sal-Gem ; as it is probably the 
Principle or Bafis of feveral othfcr Salts. 
Sea Water owes its Saltnefs moft likely 
to vaft Quantities of this Salt diffolved there¬ 
in 5 which, being extracted by different Me¬ 
thods, becomes either Ray-Salt , or what 
we commonly call Kitchen-Salt: and Springs 
running through or over Beds thereof, and 
becoming faturated therewith, afford by 
Boiling and Evaporation all our Inland or 
This Cube did not fink, though heavier than the fait Water, 
any more than a Needie, if laid on Water gently, would do, 
and for the very fame Reafcn : for when a Needle is placed 
in fuch a Manner on Water, a little Hollow is made about 
it, filled with Air only, in which it lies as in a little Boat; 
becaufe the Bulk of the little Hollow and Needie together 
is lighter than Water of the fame Dimenfions. A fitnilar 
Hollow was formed about this Cube of Salt, which enter-? 
ed a little into the Water without finking; its upper Sur¬ 
face was dry, and rofe above the Surface in the Hollow, 
though not fo high as the general Surface of the Water 
round it. Other Cubes of Salt cryftallizing along the four 
Sides of this dry Surface began to form a fmall hollow 
Square, or which the fir 11 Cube cornppfed the Bafe. Thefe 
little Cubes, when joined together, becoming heavier than 
the full fingle one, and being encompaifed with lefs Air in. 
Proportion, from their Jundlion to the fir ft by their inner 
Sides, funk full deeper in the Water, that is, to the upper 
Surface of the little Cubes which adhered to the firft Cube. 
New Cubes of Salt adding themfelves to thefe, funk the Bo* 
dy yet lower down ; and others continually joining them af¬ 
ter the fame Manner, by enlarging the hollow Square, fiill 
plunged it more and more, and formed the inverted Pyra¬ 
mid; which growing at laft too heavy, funk to the Bottom 
of the Water, and then increaied no more. 
Rajkot*? 
