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XVII. Extract of a Letter from Mr. Prof 
Geo. Matthias Bofe, of Wittemberg, to 
Mr. W. Watfon, F. R. S. on the EleSiri - 
city of Glafs , that has been expofed to flrong 
Fires . 
Dated March T * T , 1 74^. 
* * * 
Read April 6. 'F’x feemsto me that a Glafs Ball, which 
1;49 ‘ has oftentimes been employed for 
violent Diftillations, and other chymical Operations, 
does fend forth the Electricity incomparably more 
flrong than any other Glafs, which never fnce its 
making had been expofed to a violent Fire. As l 
am the firft that has mentioned this notable Circum- 
ftance, be pleafed to let me have the Honour of this 
Improvement in the Philofophical TranfaCtions. 
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E R R A- 
