PHILOSOPHICAL 
Tranfadions : 
G I V I N G S O M E 
ACCOMPT 
OF THE 
Prefent Undertakings^Studies and Labours 
OF THE 
INGENIOUS 
IN MANY 
Confiderable Parts 
O F T H E 
WORLD. 
Vol. XI. 
For the Tear M DC LXXFL 
LONDON, 
Printed by T. R.for Jcka ^artyf),?nnter to the R(yal Scsiety 5 
at the Bell in SuFauh Chitreh-jArd. 
