{ 336 ) 



chla. Here,' therefore, the ftrofig gafifica- 

 tion of the enamel, by the violent energy of 

 the fire, had produced a vacuity which oc- 

 cupied more thjln half the matrafs, forcing 

 up the enamel, and compelling it to afcend 

 through the neck ; breaking at the fame 

 time the fides of the matrafs. 



In a fourth experiment I made u'fe of an 

 enamel of Procida. During a continuance 

 of eight hours in the fire, I obferved it at- 

 tentively, but could not perceive any figrt 

 of ebullition. I afterwards broke the ma- 

 trafs, and found that, notwithftanding its' 

 complete fufion, and that it was in every 

 part full of bubbles, the bubbles were in 

 general fraall. No particular gas appeared 

 above the mercury. 



Examining, afterwards, the interna] fides 

 of the matrafs, above the hardened enamel, 

 I made an obfervation that appeared to me 

 i-mportant. A great number of very minute 

 globules of the fame enamel adhered, here 

 and there, to the fides, at the diftance of 



half 



