To the Right Honourable 
THOMAS 
Lord PARKIER, 
Baron of (jMacclesJield ; 
Lord High Chancellor 
Of Great-Britain : 
By Inclination as well as O f f i c e, 
Firft PATRON of Ufeful Arts and 
Difcov cries. 
This THIRTIETH Volume 
OF THE 
Philofophical Tranfadtions 
(As a fmall Acknowledgment for 
very Great Favours) 
Is Humbly inferib’d by 
His Lordp7tp"s mojl obliged SerVanty 
