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ment. The ftones were feparated by the fhock, 

 but the difference in the effedl: was manifefl to every 

 perfon in the field ; thofe with the mixture of hme 

 and powder having been much more effectually 

 broken and fhattered than the others. After the 

 fuccefs of this experiment, I have conflantly adhered 

 to the practice, and am fo fatisfied of its utility, that 

 I wifh to fee it more generally adopted. One thing 

 is certain, that a moiety of quick-lime and gunpowder 

 will explode-, and if this mixture were ufed merely 

 as a train of communication to the powder within 

 the ftone, what a national faving would it be in 

 works carried on upon an extenfive fcale, fuch as 

 the numerous quarries and mine-works of this 

 kingdom ! 



It will give me great pleafure to receive your opi- 

 nion upon this experiment, when the gentlemen have 

 fatisfied themfelves about it, and in the mean time 

 remain, with great refpec^, fir, 



your very obedient 

 humble fervant, ' 



HUGH DAVIES GRIFFITH. 

 To Mr. Matthews. 



Art. 



