1 1 o Analyfis of the Mt. 



Mercury; then I put a little coloured honey 

 at x, into the bottom of the glafs-tube z x, 

 which was fealed at the top. I fet this tube 

 in the iron cylinder n n> to fave it from break- 

 ing by the fwelling of the Peas. The pot 

 being filled with Peas and water, I put a lea- 

 thern collar between the mouth and lid of the 

 pot, which were both ground even, and then 

 .preffed the Hd hard down in a Cyder-preis: 

 The third day I opened the pot, and found 

 all the water imbibed by the Peas ; the Honey 

 was forced up the glafs-tube by the Mercury 

 to z y (for fo far the glafs was dawbed) by 

 which means I found the preffure had been 

 equal to two atmofpheres and ' ; and the dia- 

 meter of the pot being two -f-| inches, its 

 area was fix fquare inches, whence the dilate- 

 ing force of the air againft the lid of the pot 

 was equal to 200 pounds. 



And that the expanfive force of new gene- 

 rated air is vaflly fuperior to the power with 

 which it adted on the Mercury in thefe twe 

 Experiments, is plain from the force wit! 

 which fermenting Mud will burft the ftrongef 

 veflels ; and from the vaft explofive force witl 

 which the air generated from nitre in th 

 firing of gun-powder, w ill bur ft afunder th 



ftronge 



