L^7l 
upon it with fucli a ftrength as will prevail againft all that 
oppofeth itj as I have ftiewn above. 
To the fourth Difficulty I anfwer / That although the 
ufe of the Pipes be meerly for the conveying of Air ; They 
may neverthelefs eafily be filled with Water when need re- 
quires, and fo the defet^s in them may as well be found 
out as in the Pipes that are ufcd for the conveying of Wa- 
ter. This is all I may anfwer at prelent, and I fhall make 
an end with affureing Mr. Nuts that i'le make ufe of his 
advice when ever he will be pleafed to give it me« 
An anfwer of the fame to the Author of the perpetual 
Motion. 
IN the laft papers I pubUflied in PhiL TrmfaSt. N. 
184 againft this perpetual Motion deferibed in N. 
177. 1 intreated the Author to permit me to fay nothing 
as to what alterations he might mll^e in his Engine ; relblv- , 
ing to leave it to others to fliew him that upon that prin« 
ciple all he can do fignifies nothing. But I find fince^ in 
the NoHveUes de h Repdd: for December laft, that he ftill 
perfifts to urge ibme new contrivances, which being add- 
ed he conceives his Engine muft fucceed. To this I an- 
fwer that I undertook only to fhew that bis firft device 
would faile, which yet I fhould fcarce have done, if I 
had thought a difpute of this nature could have lafted fo 
long. To come therefore to the point, where he faith 
that this Engine may well fucceed without alteration, be* 
caufe he hath tryed with Liquors put into Bellows im- 
merfed in Water : I again fay that I grant him the truth 
of the Experiments, but deny the confequences he would 
LI draw 
