( 533 ) 
the Apothecary's ufe, this Gold, Aurifahri'^ hoc Aurum , ^uod 
that was without the help of citra folium opem tufjdendo re- 
Sales reducd by beating to a da&um erot ad temitatem fuffi- 
fufficient thinnefs C info*.^^^"ch cientefn(^adeoutukrAfeptmgmu 
that feventy odd Leaves did not folk vix unim firupuU p^dm 
wcighafcruple,) I found(more qmrenf,)hoc, hqtum ^ Aurum 
than once) upon putting two comferi {una vice fluries,) chm 
or three times the weight of bimm trimmve Mercmii noflri 
ourMercury to them,thatafmart pondm ipfi eommifcerem ^ i^^Jlg- 
heat wasprefentiy produced in nem in mmu men calorem mox 
my hand^ peperiffe. 
SomeObfervatiom^ fintbym Anonymom u the FuMiJber, on [eve- 
ral Fajfages in the tm lafi Months tranfaffions^ relating to fome^ 
till non^un-ohreYvtd^ Qualities of the Jir; to the Mixing and 
Fermenting of Liquors in vzcuo ; to the Hijlory of Birds \ 
the Anatomy of the Trunks of Vegetables j Earofiopes^d^c. 
JlomuredSir^ 
HAving long underftood the freedom of addrefs 5 you have 
allowed to any candid and unprejudiced perfons, whofe ge- 
neral good wifhes to the Common-wealth of Learning make 'em 
ambitious to impart fomething , whereby they may promote the 
Empire of Man above other Creatures ; I flatter'd my felf, it 
would be no unpardonable prefumption , to communicate fome of 
my thoughts unco you , on fuch a fubjefl , as that the ufefulnefs of 
the matter may keep me from feeming altogether impertinent , and 
the fmalnefs of my performance, argue the greatnefsof my defires 
toferveyou. This I refolved to do by way of Aniaudverdons 
on the two h^k Fhilofophied tranfaBions \ and though I per- 
formed nothing more, I hop'd at leaft , my Obfervationsmay do 
them the kindncT , as fhades intermixc with light, to render them 
moreGonfp cuous. In hopes of this, I fluall draw up my thoughts 
under this general Title of Some Fhilofofhical Obfervations on fome 
paJfagesinthetwolaJliMmthsTranfaffions^ viz* for Decemb. and 
January. 
I highly applaud the bold defign to difcover fome, till now un- 
obferved, Qualities in the Air; and, though the difficulty of the 
SubjcG, and modefty of the Honourable Perfon, fiefs expefled in 
Zzz 2 fa 
