Analyfis of the jiir. 8 1 x 



fix'd ftate than thofe of Nitre, they are there- 

 fore thrown off with a greater repulfive force, 

 by the united action and re- action of all thofe 

 ingredients armed each with its acid Spirit. 



Experiment CXVIII. 



Which acid Spirits, confirming of a volatile 

 acid Salt diluted in phlegm, do contribute 

 much to the force of explofion > for when 

 heated to a certain degree, they make a great 

 explofion, like water heated to the fame de- 

 gree, as I found by dropping a few drops of 

 Spirit of Nitre, oil of Vitriol, water, and 

 fpittle, on an Anvil; and then holding over 

 thofe drops a piece of Iron, which had a 

 white heat given it ; upon finking down the 

 hot Iron with a large Hammer, there was a 

 very great explofion made by each of thofe 

 liquors: But frothy fpittle, which had air in 

 it, made a louder explofion than water; which 

 fhews that the vaft explofion of the Nitre and 

 Sal Tartar, which are compofed of elaftick 

 air-particles, included in an acid Spirit, is 

 owing to their united force. 



We may therefore, from what has been 

 faid, with good reafon conclude, that Fire is 

 chiefly invigorated by the action and re- action 



of 



