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our great Grandnioihers; but as foon as (to follow the fafijion) 
we changed it, the voeight and the vtxy colour was altered^ And, as 
as they have had the wit to lead us on to change the fafliionof 
our Pewter^ as oft as we change the faffiion of our Hats , our Pew- 
ter is in every change more and more embafed : And, if our Silver- 
fmiths hold on their degrading mixtures, I fhall queftioni whether 
our Silver-plate ma||j,noc fliortly come down to approach our 
Foye-fathers JPervter : I mean in the Country, where 'tis never ox 
feldom tried. 
But, Sir, fince our honourable Philofopher hath difcovered the 
pure Gold, and digged out the Oar ; I hope, you and others of the 
R. Society will find out fome ingenious and docible perfons, who, 
for reafonable gain to themfelves,and for common good, will furnifli 
uswithftoreof thefc Inftruments, fitted, and ready prepared for 
alltheufcs. 
I havemarvelled. That the want of willing Perfons to execu re, 
arid to furnifli for Common praft ice the excellent difcovericsand 
infttuftive Inftruments, which fome great Fhilofophers have lately 
brought to light, have not difcouraged the Inventors themfelves. 
Let me offer to you two or three Injlances. If the fame Mr, Boyles 
Statical Barofcope,de(crihGd and publiflied in your FirJi VolN. 14. 
/».23 r ; or perhaps, if the Mercurial Earofcope had been more ge- 
nerally fpread in the hands of many Sagicious Gentlemen, I con- 
ceive, we fhould have 1 eard lefs noife againft the Gravity and Gra- 
vitation of the Airv I cannot fee what place the Statical Barofcofe 
would give,either for tht Funicular or for the Hohh'aff Ob je&'iousy 
or yet for the Difficiles Nug<e Both the faid fjfts of Barofcoperdo 
fhew/i? tk^eye the Gravitation of Air from the heavieft to the 
lighten^ inaUchaisges, to every degree , and muiually explain and 
confirm each other: And the fmall Hydrcjlaticallnjlrumentxmy 
make fome refemblancc of the fame or like importance, in Liquids. 
I guefs, that in a very longc/^^r G//?/one may fee, whether the 
Bladdersof thofe Fijhes which have the thiimeft and cleareft film, 
do expand and contraft , as they afcend and defcend with the By- 
drofiatic Inftrument, 
My next Inftance may be the Celefiial and Aerial Magnets , as 
propofed, and to fome efFefls difcovered by Mr. Boyle. But this 
will hardly be throughly inveftigated by any other than the Sons of 
Art. We fee, with what confidence fome men pretend to Afirologj^ 
even 
