[lo] 



recite by way of confirmation, the before 

 mentioned refpedlable inllance, againft there 

 be occalion to apply it. Which rule of 

 judgment not thence alone, but from divers 

 other experiments ; I having early formed 

 and followed in this whole defign, makes 

 me not flip this opportunity to obviate any 

 reader's miflrufl:, that I may be about the 

 making him wings to fly to the moon, or 

 pumps to walk upon unfrozen water. 



My next pundlual obligation is, to inti- 

 mate the form of my delivering what I 

 have to offer hereon ^ as wherein the weak- 

 nefs, or flrength of my arguments will lie. 

 In which I find myfelf happily praeadvifed 

 by the Honourable Mr. Boyle, Wherefore as 

 the fame may be a guide to fome reader's 

 caution, or confidence therein, I will recite 

 his own words, as they will add dignity to 

 the import, 



" Whe N a writer acquaints me only with 

 his own thoughts, or conjedlures, with- 

 out enriching his difcourfe, with any real 

 experiments, or obfervations, if he be 

 miflaken in his ratiocination, I am in 

 fomc danger of erring with him, and am 



" at 



