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XXVIII. Some further Obsewatiojis on a new detonating Sub- 

 stance. In a Letter from Sir Humphry Davy, LL.D. F. R. S. 

 V. P. R. I. to the Right Hon. Sir Joseph Banks, Bart, K, B. 

 P. R, S. 



Read July 1, 1813. 

 My dear Sir, 



Berkeley-square, June 20, 1813. 



1 HAVE already described, in a letter which you were so good 

 as to communicate to the Royal Society, a few facts respecting 

 a new detonating compound. I shall now do myself the 

 honour of mentioning to you some other particulars on the 

 subject. 



I received, in April, a duplicate of the letter in which the 

 discovery was announced, containing an Appendix, in which 

 the method of preparing it was described. M. Ampere, my 

 correspondent, states that the author obtained it by passing a 

 mixture of azote and chlorine through aqueous solutions of 

 sulphate, or muriate of ammonia. It is obvious, from this 

 statement, that the substance discovered in France, is the same 

 as that which occasioned my accident. The azote cannot be 

 necessary ; for the result is obtained by the exposure of pure 

 chlorine to any common ammoniacal salt. 



Since I recovered the use of my eyes, I have made many 

 experiments on this compound; it is probable that most of 

 them have been made before in France ; but as no accounts 

 of the investigations of M. Dulong on the substance have 



