26 
MicrROGRAPHIA 
te? will'take up no more room then 45. of the frefh: Or reciptocally 
45 pints of falt-water weigh as much as 46 of freth. a 
~ But I found the proportion of Brine to frefh Water tobe near 13/to 424 
Suppofing therefore GH M to reprefent the Sea, and F I theheight of 
the Mountain above the Superficies of the Sea, F Ma Cavern in the 
Earth, beginning at the bottom of the Sea, and terminated at the top of 
the Mountain, L M the Sand atthe bottom, through which the Water 
is as it were {trained , fo as that the frefher parts are only permitted to 
tranfude,and the faline kept back ; if therefore the proportion of G M 
to F Mbeas45 to46, then may the Cylinder of Salt-water GM make 
the Cylinder of Frefh-water to rife as high as E, and torun over at N. 
I cannot here ftand to examine or confute their Opinion , whomake the 
depth of the Sea, below its Superficies, to be no more perpendicularly: 
meafured then the height of the Mountains above it: “Tis enough for 
me to fay, there is no one of thofe that have aflerted it , have experimen- 
tally known the perpendicular of either ; nor fhall I here determine,whe- 
ther there may not be many other caules of the feparation of the frefh 
water from the falt , as perhaps fome parts of the Earth through which it 
is to pafs, may containaSalt, that mixing and softings witli Sea-falt, 
may papas it; much after the fame manner as the Alkalizate and 
jezd Salts mix and precipitate each other in the preparation of Tarta- 
rim Vitriolatum, 1 know not alfo whether the excteding cold (that _ 
muft nectflarily be_) at the bottom of the Water, ‘ge! hot help towards — 
this {eparation , for we find , that warm Water is able to diffolve and _ 
contain more Salt , then the famé cold; infomuch that Brines ftrongly — 
impregnated by heat, if let cool, do fuffer much of their Salt to fiibfide 
and cryftallize about the bottom and fides. I know not alfowhethet 
thé exceeding preflire of the parts of the Water one againftahother, 
may not keep the Salt from dete en 
E keep ding to the very bottom , as finding 
little or no tcom to infert it felf between thofe parts , protiudéd ( vios 
Jently togethet , or elle {quéeze it upwads into the fiperiout partsof the 
Sea; where it may more eafily obtain room for it felf, amongft the parts 
of the Water , by reafon that there is more heat and lefS preflitre. To — 
this Opinion Iwas fomewhat the more induced by the telations{ have — 
met with in Geographical Writers, of drawing frefh Water from the bot= _ 
tom of theSea , which is falt above. I cannot now ftand to examine, — 
whether this natural perpetual motion may not artificially beimitared+ _ 
Nor can Iftand to anfwer the Objections which may bemadeagainft this — 
my Suppofition: As, Firft, How it comes to pafs,that therearé fometimes 
falt Springs much higher then the Superficies of the Water? And, Se 
condly,Why Springs do not run fafter and lower, according to the vary- 
ing oe = te the Cylinder of Sea-water, by the ebbing-and flows 
ing of theSea? | 1 oe) asim 
As to the Firft, Infhort, I fay, the frefh Water may receive ngaina 
falife Tincture near the Superficies of the Earth, ‘by ‘paffing throne 
fomefalt Jazes, or elf many of the faline partsof theSeamaybekept 
back, thovgh ‘not all. Ges Sal = isttt -gainsttts 
