To the Reader. 
fure yon , that what I have in this fmall 
Tratt positively affirmed, is either from Ex¬ 
perience or good Authority 5 when peradven- 
ture what yon pay dearer for , may be barely 
Suppojitionsj and yet at your own Cojl to be 
Experimented. 
CHAP. 
1 
