Mr JOHNSTON on the Combination of Chlorine. 



10th, Most of them decrepitate when heated, and in the flame 

 of a candle are combustible, throwing out bright white sparks, 

 and leaving a dark brown residue. The salt of barytes melts 

 without sensibly burning ; and that of lead burns silently like 

 tinder, giving minute globules of metallic lead. 



CLAYPATH, DURHAM, 1 

 January 1828. 3 



