THE 
P R E F A C E. 
-YyT H A T I had at firft in- 
yY tended only as additional 
Obfervations and Experi- 
ments to the firft Volume, is now 
grown into the Size of another Vo- 
lume, fo fruitful are the Works of 
the great Author of Nature in re- 
warding by farther Difcoveries, the 
Refearches of thole who have Plea- 
fure therein : We can never indeed* 
want Matter for new Experiments; 
and tho’ the Hiftory of Nature as 
recorded from almoft innumerable 
Experiments, which have been made 
within the compafs of a Century, 
be very large, yet the Properties of 
Bodies are fo various, and the differ- 
ent Ways by which they may be 
examined 
