xii The P R E FA C E. 
examined fo infinite, that ’tis no 
wonder that we are as yet got little 
farther than to the Surface of Things : 
Yet ought we not to be difcouraged, 
for tho’ we can never hope to attain 
to the compleat Knowledge of the 
Texture, or conftitucnt Frame and 
Nature of Bodies, yet may we rea- 
fonably expedl by this Method of Ex- 
periments, to make farther and far- 
ther Advances abundantly fufficient 
to reward our Pains. 
And tho’ this Method be tedious, 
yet our Abilities can proceed no 
fafter; for as the learned Author 
of the Procedure of human Under- 
fianding obferves, pa^. 205, 206, 
« All the real true Knowledge we 
“ have of Nature is intirely expert- 
^ mental^ infomuch that, how 
ftrange foever the Aflertion feenis, 
we may lay this down as the firft 
I “fundamental 
