of Air thro which the one Inch Ball paffes • this being 
granted, I fay then, that as thofe two Columns of Air thro 
which the Iron Ball muft pafs, are as i to 25, fo the Gra- 
vitation of the faid two Balls are as i to 125. 
Now that Ball which being 125 times heavier, and paffes 
thro a Column of Air that is but 25 times bigger than the 
cther^muft needs, I fay, move quicker in its defcent than the 
leffer Ball, fo confequcntly mult thofe Particles (fuppofing 
them to be composed of the fame Matter) that are biggeft, 
firft and fooneft perfpire thro our Bodies. 
But to return from this digreffion, having firft weakened 
fome of this Aqudfortk thus impregnated with Silver, I put a 
little of it in a clean Glafs Tube,and now and then threw into 
it a little Copper of the bignefsof a grain of Sand, and then 
viewing my Silver water with aMicrofcope, I obferved with 
a great deal of pleafure, how the Silver in this clear Water 
was coagulated into fuch bodies as are delcribed by the a- 
bove-mentioned Trees ^ which Coagulation we may call an 
Inclination 5 and that I may give you a better Idea of this 
kind of Coagulation, I caus'd the Painter to defcribe a fmall 
Particle of the Silver no bigger than a large Sand, vid. Fig. 
4. P. Q, R. S. T. 
I was amaz d to fee in a few feconds of a Minute, fuch 
Coagulation of branched Particles (which even thro a good 
Microfcope were invifiblej arifing from a feeming clear Dia- 
phanous and Liquid Matter. 
Now what fliould occafion fuch a Coagulation, infomuch 
that no Silver ftiall remain in the Water, is to me wholly in- 
fcrutable. 
From thefe Coagulated fmall Silver Particles, ray thoughts 
made an excurfion to the rich Silver Stone which comes to 
us in fmall fragments from the Wejl Indies^ and which the 
Virtuofo's keep as Rarities in their Cabinets, of which alfo 
I have a little. 
Now if we feridufly confider the Silver in that Stone, we 
fhall alfo find that its Particles are coagulated in juft fuch 
branches 
