MicROGRAPHDAs 
how muchiof the preflire of the 47r is taken off by its ingrefsinto fmal- 
lex and. fmaller 4o/es, |. From. the application of whichto the entring of 
the ir into the bigger hole of the Vefel, and into the {maller holé of the 
Pipe, we fhall clearly find, that there isa greater preflure of the air‘upon 
the water inthe Vefe/or.greater pipe, themthere is upon that in:the lefler 
pipe: For fincethe preflure of the air every way is found to beequal, 
that is, as muchasis able,to prefs up and fuftain a:Cylinder of Quicksilver 
_of two foot\and a half ,high, or thereabouts; And -fince of this prefliire 
fo many thore degrees,are required to force the zr into‘a fmaller then 
into.a greater hole that is full of amore congruous fluid. And Jaftly, 
fince thofe degr¢es that are requifite to prefs it in; arethereby taken off 
from the .Air-within, and;the Ar within. left with fo: many degrees of 
preilure lefsthen the 47 without 5 it will follow, that the Ai inthe lefs 
‘Inbe or pipe.; will.havelefs preflure againft the fuperficies of the water 
therein, then the Av in the bigger: which wastheminor Propofition to 
be proved. 99199,180 19 0} vig 10 isdi | 
The Conclufion therefore will neceflarily follow, v7. That this xxe- 
qual prefsure of the Air caufed byits ingreff into unequal holes, is a caufe Juffi- 
cient to produce this effet , without the help of any other concurrent: and 
therefore is probably the principal (if not the only) caufe of thefe Pheno-_ 
mena, | , 
. Thistherefore being thus explained , there will be divers Phenomena 
explicable thereby, as, the rifing of Liquors in a Filtre, the rifing of Spirit 
‘of Wine, Oyl; melted Tallow, Gc. inthe Week of a Lamp, ( though made 
of {mall Wire, Threeds of Asheftus, Strings of Glafs, or the like ) as ae 
of Liquors ina Spunge, piece of Bread,Sand, @c. perhaps alfo the afcend- 
ing of the. Sapin Trees and Plaxts, through their Fnall, and fome of them 
imperceptible pores, (of which Ihave faid more, onanother occafion ) at 
leaft the pafling of it out of the earth into their roots.. And indeed up- 
on the confideration of this Principle , multitudes of other ufes of it oc- 
currd tome, which I havenot yet fo well examined and digefted as to 
propound for Axioms, but only as Queries and Conjectures which may 
ferve as hints toward fome further décoveries. cst 
__Asfirft, Upon the confideration of the congruity and incongruity of Bo- 
dies,as to touch, I found alfo the like congruity and incongruity (if Imay 
fo {peak ) as to the Tran/mitting of the Razes of Light: For as in thisre- 
gard,water ( not now to mention other Liquors ) ae nearer of affini- 
ty to Glafs then Air,and dir then Quicksilver : whence an oblique Ray out 
of Glafs, will pals into water with very little refraction from the perpendi- 
exlar, but none out of Glas into Air, excepting a dired, will peithon 
avery great refraction from the perpendicular, nay any oblique Ray un- 
der thirty degrees; will not be admitted into the Airat all. And Quick: 
filver will neither admit oblique or direct, but reflects all 5 feeming, as to 
the tranfmitting of the Raies of Light , to be of 3 quite differing confti- 
tution, from that of \4ir,Water,Glafs, @c. and to refemble moft thofe opa- 
cousand ftrong reflecting bodies of Metals: So alfo asto the property of 
cohefion or congruity, Water feems to keep the fame order, being 
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