' DEDICATION. 
EngTtJh , but likewife all the other European 
Languages, in which any Pieces valuable for 
the Improvement of Learning have been 
publifhed, are alike familiar to You. 
The Honour You have done me in com- 
municating to the Royal Society through 
my Hands thofe curious and elaborate Ex- 
periments you made upon ^iiickpher, can, 
not be acknowledged by me in a fitter Man- 
ner, than by dedicating to You this Thirty- 
ninth Volume of Ehilofophical Tranfa£tions : 
which likewife gives me an Opportunity of 
publickly thanking You for the many Marks 
of Friendfihip and Efteem I have received 
at your Hands, for the Civilities You have 
always fihewn my Friends, and the Ho- 
nour You have done me in continuing an 
Epiftolatoiy Correlpondence ever fince I left 
Eeyden. 
I reckon it a great Happinefs, the having 
been near five Years one of your Pupils, 
during which Time You were fo kind as to 
. direct 
