(3^3 ) 
IV. Some Philofophkal Experiments^ commHni* 
cated by the Right Honourable Sir Robert 
Southwell, V. P. R. S. 
I. To waJ^ the Globe Looh^ng-glafs.^ 
TAke Quickfilver, Marchafite of Silver, each Three 
Ounces, Tin and Lead , each half an Ounce ; 
thefe Two firft throw on the Marchafite, and laft of all 
the Quickfilver, ftir them well together, but they muft 
be taken from the Fire, and be towards cooling before 
the Quickfilver be added ,• let your Glafs be well warm; 
ed, then pour out the Mixture, and roll it from fide to 
fide- 
IfotCy This will do alfo when cold, but 'tis beft whea 
the Glafs is heated and very dry. 
Ifote alfoy That if at the Glafs Houfe, your Ball be 
of Yellow Glafs, then all will Ihine like Gold. 
\ 
Hhh X 1. To 
